Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fc7fb7fed4d8d4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 22:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b86d0cdbc39e1bf3a65b89f4e7ea8211 SHA-1: 58570deb60b1978d110a3dcee1cd01333d36ebdf SHA-256: 80fc7fb7fed4d8d4334938f4a1d294ccc5cb12aaf2e909a178cbb9044cda6141
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. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the PDF's nature as a link farm is a strong indicator of malicious intent.

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) 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://wastran.ru/uplcv?utm_term=can+you+screen+mirror+to+a+firestick PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4cb53fa823201c9b8f5a240f283ecc18/kavufewo.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/48327782334.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/15511038057.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gepetipomokakurafi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pokuzudobikuwedovenebujit.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/15549638883.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1baec227554932c5337afee3af35a33f/witigisid.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pivab.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a347b3f52---31292720742.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/buzukutopuxavonupeb.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/22468301065.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/puvelete.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tenawuno.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/66016736104.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/wimivorowidinowetupos.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/vejorekabujodemexudoso.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/lomoporusom.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/munopixasob.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/raperarujotijafigu.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/83627253447.pdfIn PDF document text
    • https://x-software.cz/data/file/42059817407.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391b04836fc---derapo.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/komodivolalezata.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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 14408 bytes
SHA-256: 0ff0ced0adf588238519d05df5804be17181208930486daa37a0e57924b61d12
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10788 bytes
SHA-256: 4d8c1ae9709b8edb8bd3d3419eeb3703140daa56ff3a9b0e3a5885b2f7ae583b

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