Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9c62841bf226a4…

MALICIOUS

PDF

75.8 KB Created: 2021-06-25 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6c8879b57df65d778a6000a3318008 SHA-1: 8e8191404e19a29b33ddf0fc64cdfca002eaf469 SHA-256: ef9c62841bf226a4edb1893fb1e00ff99c2c1a441299940cf9cf552baa852793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of numerous external URIs and the overall heuristic profile point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+convert+pdf+to+word+text+for+edit
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc39ce3407---rizemakulifuxin.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec67a624a1---39591922918.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bba055e8f23621afb05581ad96009a58/10064046722.pdf
    • https://ukmalayalamnews.com/userfiles/file/62389039685.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162355407165.pdf
    • http://boothbayharborshipyard.com/userfiles/file/82188132845.pdf
    • http://cohensevents.com/clients/74638/File/59530455279.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/43d9ef2ab3e5396c353d30aae3a73c5f/pilofejunimuteguxuregosu.pdf
    • http://canxetaidientu.com/images/file/56477774186.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04dbdac9---54152322498.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4294a330ca7a78514b68ff6c2adba97c/74221507647.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc476c039---19584352288.pdf
    • https://mttrasportisrl.it/dati/upload/file/mamonufopojudokoku.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcef4a1f1---dudogenasevivakomuw.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ntipda0tkpcc0komtkbe1tljsd/96326136077.pdf
    • https://cafesca.org/ckfinder/userfiles/files/2785627330.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_off0000c709.bin
e27b793e6fbc50fa52daf35151b88d3f1cd0f0a618e4992a16ff71225d0733ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 16612 bytes
font_01_sfnt_off0000f24a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
font_02_sfnt_off00010a61.bin
b652ddd20102e85cbe2a76617fc00cec15a30547ba583f64a03fc9792f342a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 10484 bytes

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