Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afaf0b506435edf…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 14:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a220430e0e7268333396927263a2ffcd SHA-1: f1371806e4d9689bb8d3f004cad401b75e16d982 SHA-256: 6afaf0b506435edf99327df68557ebf63f4fcac217a0deceb745832de493862c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fractinvest.com/uploads/file/48894539263.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd4111b26---34678360953.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/16916266629.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6c868627f7ce2c1057e01136f347302f/51838639412.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/riginobavuwozevoxed.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/95775707561.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/8739020277.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc662430f5---48280012831.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/634951d44ca4c9b0124a243919b0b781/tafidetekuruxe.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mebasilefoliwutozuva.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/vidotopawasiva.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef85c91d2e---31259368718.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901095833.pdfIn PDF document text
    • http://goldmustang.com/files/files/funudurujina.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/32973071235.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/51804360350.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k0ndg9hkn25310paho87i391h3/sejamawugirata.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xirijigop.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109141257405141.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/xadofujikafa.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9e0ace5bfad958a03e71b08a7d6cfadc/19694447715.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/tuwofufapilatewibopovu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/vowinabi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zojajerevo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/46686257524.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/xixigasosibububepabulexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hollow+city+read+onlinePDF 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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10384 bytes
SHA-256: 6682fe245c41fcdaf933d991d9e7c5abd71a74c710ee516fcb23488e51a1c9bd
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 18676 bytes
SHA-256: 4c9bb89ba08310b60215580493087284ad6942c60fb440919cdca5d5f75f1647
font_02_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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