Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d277613028ea37…

MALICIOUS

PDF

156.0 KB Created: 2021-07-07 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 584aea97e7d1af8b000f7f5cb2254687 SHA-1: a01c25bf3f135c31348618cd8b43c2c5eeca461a SHA-256: 36d277613028ea37860d0b99c22a50e7c53e497cd2153f9cd33d2f2b8b227944
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting an attempt to obscure the true origin of the malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of embedded URLs and the lure suggest the document is designed to trick the user into initiating contact, likely leading to further exploitation or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9573

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://chcial.ru/uplcv?utm_term=call+off+synonyms PDF link annotation
    • https://alamansyria.com/userfiles/file/genelupivefivegazezak.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aafd8f806---7156231441.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2c18639---refenuxinilitezugowuj.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0qrkakstsq94uiucct21vmjlq2/67733069779.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4da6e0cf8---94242443637.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce69ced634e---notusuzozejinonibelitu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d73191fe---36075103731.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/11760516209.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160742fbee3fcd---95440641930.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/89836978026.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/76050084955.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f885dc59---petajusoxefezedipajuxazi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f380ff29b253dfb77061870df93119da/59152968152.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/17fc6c56b5c02a95a2f52e86456b67bc/refevu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b32cb60e8---27317548772.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0bde3907426c1ef9a0a8f629d6980135/54157933997.pdfIn PDF document text
    • http://ozari-ua.com/files/file/movawonu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/i9oo14dshe5j617pshphrog1dn/mezela.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd95fc88e1e012a13c63283049b36d4e/31597402183.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/77936607543.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088623cc304c---87517604316.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gojojuxodolufuwokof.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00021e43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21E43 37000 bytes
SHA-256: e2eff195e0675b90e5d84653e52697c7514b2064695f4d123bc6616a1b87a809
font_00_sfnt_off000167fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FC 35560 bytes
SHA-256: d8475f19b80a5472fac238b69595d3813a7116cc86c909b3b93514f6f533d164
font_01_sfnt_off0001b54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B54C 19872 bytes
SHA-256: 94fb1935f69314cbdc0d8f405b7cb2c2591189b54052fd61312e3d6c674d0aaf
font_02_sfnt_off0001efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000207c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207C3 10096 bytes
SHA-256: bce61ecc33cc045b959ac93dd6221cebe289bec0967375628a431452970de406

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