Malicious PDF — malware analysis report

Static analysis result for SHA-256 5886fdd9b263d388…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 10:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4970d14c6483f7c6f3a73d5d5b281c3 SHA-1: 2b51b5285fe74401c06d53550e55617b85ab7482 SHA-256: 5886fdd9b263d3888ac20a2a5e5518d81f6b44bc057f5cd8976368f7600270e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to download other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f17748115c6---31857543852.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ohg7tihu2gob1oq6gdnsgdnpo0/deretipiladowolojukewujuj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee024d76df7---46588427736.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8827e9a67cffb6ac8c4e938f9e65efbf/67922200686.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839bd078c72---pogewesijoxal.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e1vtki20sauc44beqkookf8u9f/36288962768.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/sinukefanudin.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf2iopjrtqundtriv8lvadi92o/pumanosesipeget.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/sarovurexubasizup.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0fb672f9---raroluvokopoko.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/72258135000.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/peratabolo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/86887271392.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5ae35e94---30868457802.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f54353dfdae---36085883422.pdfIn PDF document text
    • http://digifast.cz/userfiles/jubetevukifekoriked.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/duledumosilatozosogulexuv.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/36438304010.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfe40a65c7---webibipo.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/tulimirawutopoz.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tamalomemaxikamajugegavaz.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4701de43912b65067d410296ed413642/54845054354.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/eee1b8e40353f236d7e57496a38d3465/lewaduvuperavavare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=exam+master+december+pdf+downloadPDF 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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 11000 bytes
SHA-256: 875991368c3364a38d93847e984d2c438807456e25355fb0b6d18d597cb9ef08
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 21540 bytes
SHA-256: 13438df9fd6220a943b50cbcadd18d81c47f028dbf8cef47d918e7fdf84185d1

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