Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb4ca8b43c0d9f5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 17:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4adf183fb5cf9c89b24d5f68389248a5 SHA-1: a81090439ac365746d94eedcfe8a0b51284c4fdc SHA-256: 7fb4ca8b43c0d9f57cbe67fd9ccc8d5e6f32868a7d027a910862029991fb69fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=filosofia+y+politica+hannah+arendt+pdf PDF link annotation
    • https://mytalk7.com/_UploadFile/Images/file/76276001705.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0b7aa34df---botojexumumajezoluxix.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/eaa48b4517483ce7e1b34af169b0552a/71011898666.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1dcef9d9---kinegisubaxonupugi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/39d151c39ae91cab86079786aa15a94d/97617106867.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hejdjanid217kk7q8sg8rj0hkm/34443739328.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/35672900e9a4e1088b5ec6c83132d6e2/68219579125.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/meboxedifokiv.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998abc03ba8---depafuj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/momokeka.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/75342246009.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/filumumibutapuxu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/13029521587.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lorumoritofafakuragifobus.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/19725859653.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/30247381506.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zajinunexapiwa.pdfIn PDF document text
    • http://rld-carbon.ru/file/manofovijitinojevi.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/devakotopewesad.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2t4oeb2mhcqpoeu5vplj041bsb/redam.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a610ddbf1c3---tiwolidozopagalelugote.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/63728935444.pdfIn PDF document text
    • 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_off0000b65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 10808 bytes
SHA-256: a0cd43356309fda75aa739bfdf9ab3767c6da3a5dcbcb5c498d68c221318423a
font_01_sfnt_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 17260 bytes
SHA-256: 620056f05d99415d968661359361d307615916a5e4f8e22a15cde9d39dd55259
font_02_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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