Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9e416b3045575c…

MALICIOUS

PDF

174.7 KB Created: 2021-07-05 19:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02a070659ce96e5836bbfe9ebed5a24f SHA-1: 74985aabd272151424948c809be4347ced3539e1 SHA-256: 4a9e416b3045575c298574a2a6e260ee3cbefb1a676215a7262ccb980a9e1940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, as indicated by multiple heuristics and extracted URLs pointing to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 6

  • 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.
  • 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://estoniapools.com/contents//files/44677888100.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a354fd34368---80539148342.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/52162779955.pdf
    • https://hotnews.md/upload/userfiles/files/71148464291.pdf
    • http://www.logomarcanet.com/userfiles/file/58203689266.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4df0a1aad---wosoji.pdf
    • https://akapacha.com/userfiles/file/27257096707.pdf
    • http://caopump.com/admin/userfiles/file/4183117515.pdf
    • http://rafaelokazakov.com/file/84879395868.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/046008bbfea46cba229f971dfb64025e/jijazo.pdf
    • http://minhanh.com/files/digapizekofojufosokigiziv.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cedff65505ef77d481a26079edb68759/vinofodudamofevowapulo.pdf
    • https://argumentua.com/i/file/kejulonobajujobaligigoro.pdf
    • http://files.ibiza-ferien.de/file/67162365726.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/tutixatigadorudak.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf88b8f004---33533163872.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800cdd78b58---32073725489.pdf
    • https://glbtrader.com/userfiles/file/81235952693.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ao77il06kkv1g8jbghma45f74/53798014531.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770a145f132---24881378170.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d5f19e806---34705790608.pdf
    • https://lemanssrl.it/file/82773822068.pdf
    • https://synersys.fr/contenu/file/fowupazotex.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7164046953---88147943796.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bdkapp1gm5qjq44kasjlu4irr7/bikidin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=world+history+human+legacy+crossword+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d6b5.bin
6d6e0d38ffc69277f21ca96e735c62712dfce2627b343b573df4d8dca07f2189
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B5 37732 bytes
font_01_sfnt_off00023e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23E75 16792 bytes
font_02_sfnt_off00025687.bin
8eccf28ebe2f5a93772724231e369f0a7a4296ddeca39ddc32962f494d292378
pdf-font-stream PDF embedded font (sfnt) at offset 0x25687 22784 bytes
font_03_sfnt_off0002907d.bin
79cf787f8daa8a9af96b2970c1b1bbd29381b3471c066c5d3047bb7bce598949
pdf-font-stream PDF embedded font (sfnt) at offset 0x2907D 11112 bytes