Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f434bc57fa85ed…

MALICIOUS

PDF

103.4 KB Created: 2021-09-07 13:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29b61d481614f146111851161042824c SHA-1: 8d0f5058e9265258cc4eb1646c6acc07bd2a6504 SHA-256: 70f434bc57fa85ed51c7590822695be4ff258301f5f4a1878aceb864ba6dd873
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b8a9e15b966db0ba6967ed66f5e7bb4f/49586783482.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97c8a948---nazaduwujaboromev.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/58547681008.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0144106a---fagidesi.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/faxibonatokovowo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/29949686351.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/55605363341.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210628174247.pdfIn PDF document text
    • https://limsurdua.com/contents//files/dorisamofukedem.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e77aamsg542v0e49tc2n1tose6/gozekikupenitujojaxurogod.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/59eaaea55d43b0e6dec89b4415043786/47863139453.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/q3jcnuh5m6k82km74bp7u8l7t4/27162418530.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/46595320958.pdfIn PDF document text
    • https://limmaginebistrot.com/file/salexumokizegefomewamibad.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b93bc60d6---degarimafijufapuk.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082abe9d99fd---mebumi.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/pq5o2mdid4kp14ena3bniuu8bl/5783009676.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/28560047035.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/89469326706.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16129a4ea28692---39716989067.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/53202601619.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/16860773176.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63840684849.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/wuramotikiwawevixidu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/dbe1195327813fc7cb5116df42a2365e/59671910136.pdfIn PDF document text
    • http://espokebar.com/uploads/files/fosetagawadixonowike.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/160461736b619520f89ae168fc075250/14466159014.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/89953634290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=piggies+in+the+pumpkin+patch+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 10996 bytes
SHA-256: af03256fd34d4726dc37c8877dbaf760ad3bb40e9cd06302b9557e858af50d06
font_02_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBE 19516 bytes
SHA-256: 818da40d45f9c6e4990d843a6123ccaf6a2392a62cfc60b1dc8769caa5a4c1d8