Malicious PDF — malware analysis report

Static analysis result for SHA-256 4160b438f5b0fed1…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 07:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3d07d05378855225cfc4cee8461601b SHA-1: 8f1edf81da59e369cb015fe75524fe6d1c1ea464 SHA-256: 4160b438f5b0fed130486ac2a4732fda9cbba282d7dba2526ef2a2b56abd86bb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Numerous external URIs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=fha+residual+income+calculation+worksheet PDF link annotation
    • https://gilbertems.com/videos/file/45608475290.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb5592a57---fabugixikinerivovedox.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/61765052143.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/47736f1664288e1677cae3bd7d3b0adb/56439463607.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/kimodanujivakelizobof.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcbb16a2b---21615744959.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/25785481175.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/39559100733.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/jojimis.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nadulizenuzorosibevuwogu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/844c4ca6c8aec3e492b352b65d13bf36/dabobafitidisekorefu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070f85c02f23---82273308935.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bumabazezisomuxel.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/73418743316.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4730647d---92712374522.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/forafakakakaguberasaf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc44b71fe---42995640867.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250cd8b6eb---nizegigozeref.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/29304635951.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/tumisekusakebu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872085d9bb0---mexuwipewobu.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/napowas.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/40301732666.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_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10888 bytes
SHA-256: 34baf18bbbb5971dc9a8fd96f8c0d49a472a1020ffe51a947bfebb5830f42e6c
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 18104 bytes
SHA-256: e6840b81d124c0a95c6d1ea7bb23a531fc7f63ba6103e9aebd3cc680db995d6f

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