Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd8d7327bb1c142…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 05:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7ee988c457c94da34a07a98a0c527f9 SHA-1: dd92fc700346b366a97bb752532c76803811693c SHA-256: cfd8d7327bb1c142bafbadad286168d625cec1b649808ae748496e36492c14a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs hosted on compromised WordPress sites and disposable domains. These links are likely intended to facilitate phishing attacks or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=adjetives+starting+with+h
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cda68a0f278aa4ebfe5b96935bc11451/94416530830.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f2fe456c43318a1612976b4431918eed/27803032577.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077697a10640---gelegenunavozex.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/9oa4r538cdmnit445g09sa057n/mirujelorusogos.pdf
    • http://beastyenergy.com/userfiles/file/zeraxu.pdf
    • https://csodamalom.hu/files/files/48184388664.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7063e963---sedojuranosadegenogixosap.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9b9059b2fabb27736de9a2217b38df10/rejefunawoxoxivudobimupo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f872b3c664e8384213a9c0ff82f97548/5542041890.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e11622bc---wetud.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f651037c---67612135273.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec60275d6---tetojerezukopogakog.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e71e5213f---11430882934.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/69075663554.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2e8jfcqqe5i5nn2ie8cc4e8gt2/66803077887.pdf
    • http://www.aluvascientific.com/UserFiles/file/87006618409.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca339044e9b6d4ec71f1628c6d7495a7/bufigaxoji.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d82e909a5---xaxekevowub.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ivhjm3ue80rqmblcnj1mtltqcp/72657945726.pdf
    • http://hanasushipickup.com/uploads/files/vonezirijikizifexomazepop.pdf
    • http://ccforum.kr/uploads/file/1621539401.pdf
    • http://cuacuongiare.vn/upload/files/pozarewezofiv.pdf
    • https://cowichanseniors.ca/userfiles/file/vemagiwevikazutomafugalik.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779a62837ee---63123553065.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40b.bin
0c0a22afcf543ad8d16db7d7f815e6b7fd4cae0850bab49788b87cd3b1e14ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17260 bytes
font_01_sfnt_off00012082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 16792 bytes
font_02_sfnt_off00013899.bin
b4d454a8a28f1945b8012be2f603d34dd570320712662ddb81640a70108eeb6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 10624 bytes

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