Malicious PDF — malware analysis report

Static analysis result for SHA-256 6719bef8b70c3f7e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 07:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c22809f9b7c40bd3cfc93e7a40ceac6 SHA-1: 27bf43274d87335452a5b1481edfc8bba1a042e6 SHA-256: 6719bef8b70c3f7e022e2b1fe3452752938311fc137ce3c64aa9b6cf3c10850f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised WordPress upload storage and potentially disposable hosting, suggesting a tactic to distribute or obscure malicious links. The presence of numerous unknown URLs further supports this, while the document body is heavily obfuscated and unreadable.

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ae56ab2d---31141412324.pdf In PDF document text
    • http://vizugy.hu/uploads/files/1308502970.pdfIn PDF document text
    • http://myslizdrave.com/soubory/83625523974.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///mifopotekutomodekujor.pdfIn PDF document text
    • https://master-service.ro/images/file/rejurexesamifapu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kesafagitoxelifubudes.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/82417118646.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d8cbc73b7ecad6d8c58647666f33903/gukevukebawavefozozowekoz.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/86682211100.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/benakij.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d24a1cc---4543419307.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e8842894e42ed81aba1d1f6d1e879df3/51790001458.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc65c7f843c218b48d88e3d9d83ba965/92176238685.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/pibus.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/46059326096.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8857e5d5---7196888426.pdfIn PDF document text
    • http://e-sportis.com/images/upload/sewefenemetomuz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hms3nq9qo4hrlgvm536cgqejtd/53138587034.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2cf620ebe6e9657a2c3d6ca060175011/nalutegu.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=auto+electrical+manuals+pdfPDF 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

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_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 10864 bytes
SHA-256: acb5c59e55a14a6c478b16d5169372eb900d57db649e4edb31468c1e8994fdbd
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 17864 bytes
SHA-256: a2f18b6381bb2f44f63521fdb65ad4cb59a45d4bc1fc421941bf3d7ae8fb9753

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