Malicious PDF — malware analysis report

Static analysis result for SHA-256 339067b26a5986ac…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 20:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9c1e0f934a3be90e463c0645456eb34d SHA-1: 6857c884b7ebea0fa2ae2e148a5f98c6749034e6 SHA-256: 339067b26a5986ac4ef7e28ae7e374118b2f582b016d28be3c1b98dd4257baca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO spamming operation. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=top+50+best+android+phones PDF link annotation
    • http://cateringkieuan.com/uploads/userfiles/file/wetare.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b83ece98d---senujusavitixarugexa.pdfIn PDF document text
    • https://equalland.com/uploads/File/27787443199.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/54937327217.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb61b84b---fesidevotevezereduxora.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tajikenodizasudizezawuvud.pdfIn PDF document text
    • http://handgun.ee/media/file/sodiv.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/nukatixozed.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/revipozon.pdfIn PDF document text
    • https://csodamalom.hu/files/files/zadetakafope.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/75278132923.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/watokagumuvesagodef.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/levefuvimoladitel.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xosetafojiw.pdfIn PDF document text
    • http://cascad-trans.ru/files/26548404280.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030056296605.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/35761948197.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/89716285082.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/11819238357.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab85e9c2c---jigak.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/sesapupadinuke.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/2662572967.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10800 bytes
SHA-256: a17e06d9d36fca154badc229d423fccc4a7eb2ac6ceeeb4f06f17ba25fe3b6e3
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 17620 bytes
SHA-256: ce8eb0b6da2572fc83ebac2875cfa87268c83e00b5fae100224b301354c6555e

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