Malicious PDF — malware analysis report

Static analysis result for SHA-256 013bb8f9cca7b8ea…

MALICIOUS

PDF

80.3 KB Created: 2021-06-25 17:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32ed29509540c83143e3351f440a980 SHA-1: fa3bffeff863c96e66307a5482930c3a171a4bc4 SHA-256: 013bb8f9cca7b8ea8f9ac0d0dc35f7ab27873f9586606bd9fd68405d85c325ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, likely leveraging the embedded URLs to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=uwharrie+campgrounds+nc
    • https://alice-immo.com/userfiles/file/miwobaxoselopudufi.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/iovmu1b44pqd67u7oa0g6stq16/80376130312.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fqd9fha0gnmgnvmt813olemnj6/4442224319.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ninfesnihbu7egaldq4jru2ma/nuninajan.pdf
    • http://homenet-spb.ru/userfiles/file/zubuvakozelumiguro.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d255d92b3cf577bd4f98a7aabdef2d5d/65963904917.pdf
    • https://europartner2.pl/uploads/34777594765.pdf
    • https://art-lamps-rali.eu/files/file/samososuguvarejasazureda.pdf
    • http://sacoorhealth.pt/site/upload/file/26230673095.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mnhe49fg2o20rhvclsaagcd1n2/78589034216.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac93b92c915e618904100a9f4eec0b96/88967033309.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7d05e5bd9584258eebfe0b18f73b4fe/27885008179.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/57357512429.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/dezanafolosuse.pdf
    • https://b2cexpressdemo.com/userfiles/file/ponemusekuvaletibi.pdf
    • http://wolfroccatiassociati.it/userfiles/files/86412709532.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb047ac363f---bomofafujeziromive.pdf
    • http://aarogyamedico.com/userfiles/file/meguv.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fd8ea758---zafivosodek.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/bde571d4d82d258c21a3e24d45fea70b/suwosubetivovofe.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/isuj1tbvokulrrf0l4c7777tu1/jofabonituse.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d609136f1b---68104747449.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/758e7b345945c50607bb3e39b67ba25c/39845112331.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b61928c435259f021a5546361d9c7ade/zetomanasatinaze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16792 bytes
font_01_sfnt_off0000ecc7.bin
76c60242e8032a944a2c52c6a5074fd447ac11c73e60b7621cdd974334cb232d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17480 bytes
font_02_sfnt_off00011add.bin
e872f7b7258619de94132d0666dcd62f25cd24bdfc26f01ea79b2f74008cb229
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11012 bytes