Malicious PDF — malware analysis report

Static analysis result for SHA-256 059c45a6e000114e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 15:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80b584e15b1fc31822e41dcfb58880d5 SHA-1: 48d3dacdaee3410ba3756fab94550292c1b7195e SHA-256: 059c45a6e000114e06e6ee7e04aafa6906ca26809019e43deb4552f9f5bcda5b
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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/760f2c0165c07bd723503e1b028c54e4/natedebodupovutuz.pdf In PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/30964909233.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2fd166e54d3e02fc50b7f9aa9e5692f8/mumubavamixapug.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b645ac46af0---sanizenaponevimetikinex.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/pozugi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/556c75d2a66bf7dfefd34a142b8f63ff/46999786920.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef14786db8---napizimu.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210630203805.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d04ed8091f124fd168d2164b3fb41f6e/49272602838.pdfIn PDF document text
    • https://schmitz.cz/res/file/muwedovirenetozodav.pdfIn PDF document text
    • http://gr-chem.com/upload/files/lazefof.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/279126021fe690cfe109429af9e73974/derimeniwirodojigofi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b39c03ba---21379939438.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/pefovunuwufotilisew.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/je43m2ap8intkhq1j3nf99g00o/mekukisekeponulewotexalaj.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/gibilakitusovixof.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5958edf90---faxulitiwonediwagatifuwe.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210805193258.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lejimegeretilavupadag.pdfIn PDF document text
    • https://guijek.com/userfiles/file/94843639331.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/pesomomebuxuwawugidufopas.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/17262136728.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f972583c38---25049444452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=guru+purnima+sutrasanchalan+in+marathi+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_off0000ba50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA50 10772 bytes
SHA-256: 981d3db6b5eaebd77dc9f4aad8ccd4b9e04aa181fc67f021185d9aa7fff37335
font_01_sfnt_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 17480 bytes
SHA-256: 8c66388d7bc77644167eee2dfa42f1bbf4c5fbc5a78f65afda54af12fe3cbfbb

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