Malicious PDF — malware analysis report

Static analysis result for SHA-256 c482dc0f004c68ff…

MALICIOUS

PDF

97.1 KB Created: 2021-08-16 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 614ddef72f54333cc63e91268989808e SHA-1: ac620af1a6996835522d233a92b0ccdf2de3d7db SHA-256: c482dc0f004c68ff9f6dc78a5f08a7a74fe5d51529514d8c53d28b84248b51ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to multiple disposable hosting sites, likely intended to trick users into downloading malicious files. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://cructi.ru/uplcv?utm_term=nest+hello+pro+installer+guide PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3fed8dbaf---66320735800.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f6294a7f8c071d61c6154ae7acb478f8/loretazemisozorubapig.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pelovovemogafatakugukaz.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b756d78b4---13449589885.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee7b0237a---12836373927.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/gibikamusa.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gigas.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a7f4a01578d9487e907122084993411/17657641623.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfbfa5d8e---defutafezam.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607470391efbd---duroj.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zerakosapa.pdfIn PDF document text
    • http://alkanboya.com/files/file///24344677730.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/52712575847.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11234185188.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5b5307cf8---nepuz.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/gorizaz.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b4d26999d85.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4ba2660f03c6ee85c4b1fe34ba4a682a/jewasufa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be3c13aa2---tamuteje.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b70igb3q05bdok0pcva92f56ef/22923500560.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/55daf56da81bb36a1167ff9b7907d556/kesede.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfd7e3594---28996037434.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f595cc790a---1191394472.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a977fa92775eb93948bf8df339f88840/datudebas.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93ca0231b7f0070a57f2c3136c2ea65a/vesixozukelifigusar.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zugenodalupojudezav.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_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10748 bytes
SHA-256: a35546e3b4f2cd5cd6e80ba9f6d76adeaaf92decfb2e3466d12dfdd9c7f63c67
font_01_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 18096 bytes
SHA-256: 074770ba2ec5becdec90fea00edd1f8a7c53f83e77ad4e58b4ee0b0ae013b41a
font_02_sfnt_off00015ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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