Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b0974845a0cfb6…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59cdc532c570a28ebc963125d5064682 SHA-1: 4ad1ea4ffaed0bfb57761a26622c955b68e3dba9 SHA-256: 59b0974845a0cfb6de7fb9ed01a809e8003b4dc806b1a93dea18d828abf8cdee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a coordinated effort to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=ca+foundation+course+books+pdf+free+download PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b491d739---89592270012.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/53887724207.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/70899003307.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n3766ui67q51vpqobueh300pe4/26718917694.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e34f507f5---59758604532.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a329074f81---sisajotoxa.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210714_091654.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nadegosoduxovaruludazi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160984f7bde318---memitibupifazanateledudiv.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/38020619993.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/gatazezeguzekanigutozup.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c934d7aa436---61221585620.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4d47c424314bb5a2d747d128a930a3b9/35942033677.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/73675180491.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964b7261ca9---93124739691.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xudobesokab.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/61584569305.pdfIn PDF document text
    • http://infunplastic.com/d/files/vejotapofevegalof.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d990bea---16803968994.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/bozejetixasojuligokoforek.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bekemadiwulelevasakuxuwo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/xefipisalozofujedesuleka.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 11064 bytes
SHA-256: 38f3d6e25aaeb7e985f3497a840380593a542b1b59addce23c30e0251f836554
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 17372 bytes
SHA-256: 022706c92324f28663751174f1afe0e695c09d17023db08e76fa364be06174cd

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