Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54d058ac6ee229e…

MALICIOUS

PDF

85.0 KB Created: 2021-08-08 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ff679986930b2b9132afe04033254bf SHA-1: 0b22065fd214f03bc1386bce13327b8ec01f344a SHA-256: b54d058ac6ee229efb94d945814cf62d6f89338a9edf30c31f6244518706e588
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing campaign. It contains embedded JavaScript and a link farm pointing to multiple disposable domains, suggesting an attempt to lure users to malicious content. The heuristics indicate a brand impersonation lure, specifically targeting iCloud credentials, and a password-protected archive lure, likely to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+long+is+ics+700.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://muacuoi.vn/Pictures/files/sabenisesaterimetufepag.pdf In PDF document text
    • http://cheumst.com/upload/fckeditor/file/dawitiliwixavadobekelakim.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rewalokoxuzikigetiw.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qjstl0mp86notos39042gcsads/dabatarufigabajuvimege.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/6296865103.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/54566674308.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/2140327249.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d32f1e59c---45595930434.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/53096343235.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/dugunopezezodofewuzimepu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/bebezizanesita.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160729c42e0369---sikaradukidodabapixerux.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/46294797988.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wepiwemi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b98de3a98c2---42839454005.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/jerekukiwuvupukawi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796f1621cfa---72413729173.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/kejuwufejika.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/sqanps6m7iqbkcvpnlqb0luol1/lejevididagib.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c466116bf4c---wubuxujasanebevemu.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210610010020.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce17aa9639---35109443002.pdfIn PDF document text
    • https://hoalavender.net/upload/files/48630928212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+long+is+ics+700PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16828 bytes
SHA-256: eeeffdef2917d543ec2a57891e17cccd56efe5d420442d1d9e8c4d01a344ec45
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 10160 bytes
SHA-256: 81b05c44c7f34a7dc8cde20aaa6dea3d056fe93903370a5820a98aba0505985a

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