Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fc12b2288934bf…

MALICIOUS

PDF

96.7 KB Created: 2021-09-21 18:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5f3bb35728a3fe41ca2f9b107db62c4 SHA-1: 7559834d2a473539429f1ba00e9ef0477b463be0 SHA-256: 88fc12b2288934bfd12bfdb19fe523d05359f2ba69d49ab75b44875a774b2085
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous URLs pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of JavaScript and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=free+instagram+1000+followers+trial PDF link annotation
    • http://myslizdrave.com/soubory/68508616348.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/sumosidawef.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27888088917.pdfIn PDF document text
    • http://only-svet.ru/upload/files/lasuzajijulekiguvori.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/77068031581.pdfIn PDF document text
    • http://ed-union05.ru/files/file/burodumisujadix.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/xifadusavekazesefowun.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/74f9953488e3250e2f71794780696050/verigatixezikojaj.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/9836107234.pdfIn PDF document text
    • https://phnews.ro/files/file/93130735327.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/79913428297.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/14862589333.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/bananugup.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/dunubobigadisojijodawo.pdfIn PDF document text
    • http://millecolori.it/images/file/25010645981.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614795370cb4c---fedomonagugol.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/gusigo.pdfIn PDF document text
    • http://techbis.pl/files/file/zolugut.pdfIn PDF document text
    • http://markone-tools.com/upload/files/88651007980.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef3c78e99---79252360837.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/zokedobajazidovupebadekug.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/papoxibivumosusokogudib.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bufeki.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/89957985469.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/92990145384.pdfIn PDF document text
    • 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_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 10796 bytes
SHA-256: d668d57900f63cdba50071d804375c81cb2b572bcc1fa43548e4db9932f432f4
font_02_sfnt_off000143f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F5 18640 bytes
SHA-256: 53de2996842a88a60fea140acf103b6a0c7ea3edd7c3b4afd633f11c53681a33

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