Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ab0b418ad597d0…

MALICIOUS

PDF

82.6 KB Created: 2021-08-27 14:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b06ca7bc8a21fe092163ba040f8907e0 SHA-1: 83d2be74a1cf129a28a6eec06f65f2b557b4e2f5 SHA-256: 51ab0b418ad597d03ed017fee66f271f1b3700c72bd2d52b4253460f60c4b4df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the 'invoice/payment lure' heuristic further support a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://betheaskssd.com/flash/betheaskssd.com/file/10209579886.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/28omga8jcestu1hgroj626e4e4/61501229133.pdfIn PDF document text
    • http://mayjack.com/upload/files/44992698856.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mizekutidesetemozusolup.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gexivogunam.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qm6nsja39mejebpglacn52hpfb/kilezezososemiluzuvubugo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0a337c32---93000795726.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/79830678579.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/89066282945.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/34377699952.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c94623c94---kiledoxulimuwove.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/97317103036.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/85854939886.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zadagurafeperiwixeb.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/84200609513.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/bajixuwupubazaze.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/dujawikavovanetutavu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/xeparumemanesuxu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d831c689a8f1b65cab1468ce1bbdd0bd/71812383901.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/29747498744.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xazoberigaputag.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a4361ad774359c7ba4be7cad3c98983c/ziwur.pdfIn PDF document text
    • http://vititanon.com/user_img/files/51706581584.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/wuguzopazaregoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=history+of+state+bank+of+pakistan+pdfPDF 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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 10780 bytes
SHA-256: 08b96be502b4bd7cf23f69d2bbc231975bf260f80df4dc78b6d633744927b2b0
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 17908 bytes
SHA-256: 87e22721403b402ae8450a51a1c7345246c3218b0e87e5ab76f606e24a56bcdf
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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