Malicious PDF — malware analysis report

Static analysis result for SHA-256 6420c0bd32e1cef5…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 18:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21a132aad7e90511abeebdeff33755d3 SHA-1: de9578b04db8a303fc6fecc6d0a57f3c8ed3ccf5 SHA-256: 6420c0bd32e1cef5c210621010c9182b634ef25cece262844ad7c83868e2ef03
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing. The presence of numerous links to compromised WordPress upload storage and disposable hosting further supports a malicious intent, likely to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16114056868646---dexadujuvesije.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/32bb922a32464c07342d261aa0d3a74b/pusaxutogeledirigovo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/33000289611.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/zafojalixowad.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8b00f085ac5325c2b0a83cff89a1ba76/38718309354.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8da977122---xolidelalu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/m2rbib0qf5v423t28q88k1eu61/57405462336.pdfIn PDF document text
    • https://renault-service.com/userfiles/11819528166.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3e487a7d3336e18ce6c7a01a64979f35/wejipiropase.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/fewijiz.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c920da44e96d3c675be2c4ec7370fc92/27433771674.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0f227abc93c150a6644cd3e1ee0b2e9a/11908107944.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/97143899664.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9901898899.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/10385516146.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/75864985022.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zizexilob.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/jugimirel.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2210def0---72978520776.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0cd9695fd213e43b240c5610301814fe/37908283609.pdfIn PDF document text
    • http://alkanboya.com/files/file///10886931169.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f31e06566fb98eec223397b3973f142f/pesipevarufevukuxujavax.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7c11dd6d---butowalajuwupona.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/99621100633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cignal+hd+175+channel+listPDF 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 18104 bytes
SHA-256: 00c955bfa13be1e840b3b95c0af9b445c70b162c61b5a17d6ca8072c15ee9379
font_01_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 10696 bytes
SHA-256: ced3b74c0d9e48ad924b5d43c8982d7cb8d9c5dcd5c3f6125edcada4a1c27020

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