Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd80b7375752fa0e…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b80ea1fe84db40c92af8efb0e27bca05 SHA-1: 25dfe46b224ccb5eba259f2d600903ec64c5e1c6 SHA-256: fd80b7375752fa0ed4e159c16c9da78953bc5e0ec067e0718629dcf25e03a114
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable domains, likely serving as a distribution point for malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=when+do+you+have+prom+in+high+school PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902af62e01f---pinojufupogaluravalesumug.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/933acc148a0e48caedf82633fd40560a/bokivexevad.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b5e28d410caac281a120ed852387a24e/zawerajeperavafoguje.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/84533482989.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/49972218694.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dc587af7---rujetiwizinulowebe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cbc2dba4---fobuganasuxonibi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/58169b6d2e8095270586dbe27e531c57/geken.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/dakopasiz.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a475c7559d8---5505385398.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/56a9c375c607437a9d992b86fcec657c/41717059455.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160798350ba40d---60749931018.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabc37ee6ad---denisutude.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f5fc296b84d358a66b64b4daa3c6e418/rasefadarovenibaridu.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/31382339522.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abcea517c---votuzezobefagajeb.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/92905041211.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a66c8d3b44e0daf1a22f6ac0478ce910/vulop.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7cbdac6cf0cab0b85c3464ec6a49c1c2/wiratisitulogalu.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/legodutorutijibeliwevosap.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/69103395857.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n8kfq0et8l1lsc1jilfal0amq5/pomobejiwejizowug.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6fc9c16560fd82fb84357a942f3a5bf6/fijufuxuxa.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/pexopuniwadifupona.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/16763009.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53243316622.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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 17356 bytes
SHA-256: 5d17758a1074380e1751bae629df8c0488a3a65b2231dc7b51a04299f0a7a6b4
font_01_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 11136 bytes
SHA-256: 452e2ef0f03900b4b10c6d55e0ebbdb9f2c5c5ec7f72e8e0ba9a9f4e5ef4e1fa
font_02_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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