Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ed6680998c5e29…

MALICIOUS

PDF

72.3 KB Created: 2021-06-28 08:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76b28ede0973b4bdf85ac3739e991120 SHA-1: 320c8defaaa0dd19934c77cf51e0d4f1c09977d8 SHA-256: 33ed6680998c5e29f15c31117ee18d09004e31195ffba13b3a8cb643b55e67ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and is flagged by a machine learning classifier as malicious. Heuristics indicate it functions as a link farm, potentially for phishing or malware distribution, and also exhibits characteristics of a callback lure. The presence of numerous links to compromised CMS upload directories suggests a pattern of leveraging vulnerable websites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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) or Microsoft license-boilerplate 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://pistant.ru/uplcv?utm_term=blood+in+tamil PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qp0psoqte0fr9ko5623pe7bl21/88040911262.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0l4sh9nadk01jkkpbudc83ioqg/48807338173.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216222128466802.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/gopesotorotovagi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092eebd64c06---tovulefuzosidimatinome.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089dff8111cf---40656233064.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f133348b572c099f9a798556028f905a/bexiludatonuz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/971c263bffa71951c55cfbdb125829c8/punupovike.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vatuxa.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07e02974d03546c66c2381197c1b9ea/xewuziladewizuleful.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f89167c6---susoladawav.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/55891470109.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b82fd1469---57636039524.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604a34cf86---xarojemasutonerawisejeda.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5e1324aaaef92d58c5f8abe5006f712e/1025157982.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1ab3da6e9---53297700744.pdfIn PDF document text
    • https://autopratichesas.it/file/3470657320.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/xedif.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/71115289932.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zitobidutadovewerebagu.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/98129860512.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9eb67c18a---79018021387.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e967841f---33664775146.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bb4422a2---xudavajedevesixek.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 15116 bytes
SHA-256: efadad34a781d737460a0eaba5572837fd5b2d330b31050ec5edff15fcccfa6f
font_01_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10060 bytes
SHA-256: 9c1bff2d15f7cf1b7291cf629067be7e727375b40ce61467d4a543d82b66a5cd
font_02_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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