Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f472a1e087037cb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-03 09:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e52c0fefdbc5cdcb031db9a8eced15a9 SHA-1: 534bf20869a97fc43c71bbf60308314cfbab295b SHA-256: 4f472a1e087037cb49c0ce3b50e87db6aa25366f1685c9908b775b08afef764d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://anandamsanyal.com/userfiles/file/zivodaxiwanituna.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bdbef28f---nekopodajuxasototeji.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210531181047.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ee6a70bc---duwitajuzanugixul.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/96bdd57ab7a85597224c702d84150e18/61913448365.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/ximej.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f16dbc9e---sadixa.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218211226399127.pdfIn PDF document text
    • https://drlanda.hu/user/file/23642833995.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hq52hktn3qvg83480r9eampull/lujezemufoteg.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/piregup.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xomuna.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/27706312115.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/wufowufubenuxazetexa.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nalepolorijado.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/98880793245.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/42443589694.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/gixasot.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/91614237126.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a93eddf3581---goxukugux.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nepibilomesusuzukemur.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/45943491594.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/1381978235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=etomidate+davis+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 16164 bytes
SHA-256: a95d9844f8e26f242da3efdb92ab110ab2813f6e32efbcb5d1a127ecc70d0a04
font_01_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10460 bytes
SHA-256: 534150486a9a766fee16f55b2477900daf5b2f06b2347d20aefd53dfdc1f2556
font_02_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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