Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a65df6e38fdacd…

MALICIOUS

PDF

89.7 KB Created: 2021-07-16 05:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cc29b7ae7c1b4738ca43ae964ef765a SHA-1: 99bb8125f0fc4b014731f60ef33e712e9c92b8a4 SHA-256: 41a65df6e38fdacd9f3db6f3ef6f6335a271d00210d3d838172e0bba4c909e0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or fraudulent billing schemes. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, aligning with exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://accessiblevehicleservices.com/userfiles/file/vuvitugos.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5haa2ph42flss8h94ignmseoc3/33393727892.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/bidevutiweminivofo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/24a8cdfaeb633a866a9adcd9d287cf86/79081013208.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/74711986493.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/mugabaf.pdfIn PDF document text
    • https://isleo.com/i_photos/file/59771221191.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rigavabanovef.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/nuganixujunupefisof.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/55684691721.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f1378d75c7d3342dbe8b8102cd8f3427/47712314392.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e4f2400fe---mifezejapunu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f82c3b2---xivudasabibawanimenenati.pdfIn PDF document text
    • https://susta.vn/userfiles/file/viputaxodimokadaw.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/508db8731c843d435744e5e1f3ac18aa/77774650900.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/l931e2ppqk9e274aio3qbhtfak/piweporiwoburidi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0291a740a1aa57ebad6d392c80688e3f/xobod.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0ed99eb60e6414819da30d384d2ce71/wenomamijojuxexamelan.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bc488a1d---kuliduta.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kejovopemotirazopasojonew.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c60638aa---2282240290.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sonaroku.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/99369318304.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47ae4f940cff00a34ce177b202a16f45/3224812665.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/86388530327.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-20/20210620194415391120.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/61085943051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+phone+is+ringing+can+you+answer+itPDF 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_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10872 bytes
SHA-256: e5201be4fbbdff582503acfeac0307ea81949287b7bd51b24615543e213116f5
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 17504 bytes
SHA-256: 4b1e2dd99539fbf956fb745fe3c5e11678cb7069a7a296c6e01451fedd5e80a9

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