Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d52f0058a6ca596…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 227bdb992663a0b569f1dcfa4b2a93a4 SHA-1: 4bb43891e95ea4d355b13fcc15dd6ccaad802fb6 SHA-256: 6d52f0058a6ca5966dfbe21e7941661c4de9fa5e2df015cf4c915237a071d0c9
164 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The high number of external URLs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://euredit-editions.com/userfiles/file/8017330759.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140bd145a569---tisanuwiwijinu.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jitezalikadagoju.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/adec3aec7435ad1c1ff453ef7a64ef8c/gumugilivi.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/88485984997.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/79610313299.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/jozeruguripegoxixu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae2461b41---totamewuluvabesi.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917084659155697.pdfIn PDF document text
    • http://palami.by/images/file/mubot.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/21373945503.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/14804258015.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/71706345937.pdfIn PDF document text
    • https://kede.org/userfiles/file/1939946700.pdfIn PDF document text
    • https://mollis.rs/files/55342579504.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/belenexobowamex.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vasubefaz.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/nepatedorifeguwapezuw.pdfIn PDF document text
    • https://plasy.com/uploads/file/patozo.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/nevupibetefuda.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/rasisitidalibolonux.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/70034702538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+install+android+ice+cream+sandwich+on+tabletPDF 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_off0000aec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 14652 bytes
SHA-256: 6fb0d86f7d19b3b3fae686f9517d70d355add115e081bc93c985c623de1b57fa
font_02_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10852 bytes
SHA-256: c7429a9b1ceddd9cba5b4b765d9c3ceafe8a20cb76d0588b66d4adb055354bb8