Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68aba5f0e86a275…

MALICIOUS

PDF

141.7 KB Created: 2021-06-29 11:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7290bc71ea90ee358d5177e6fe347172 SHA-1: 45bfcb75c436683466ba2f52ec4f0897b0935355 SHA-256: f68aba5f0e86a2758b0c63051f3153106ed8c41df7758a1fb209ddc42eaf762d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or further exploitation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5756d988---41034139336.pdf In PDF document text
    • https://digireg.dk/upload/kosiwazuxakimenepofe.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/negezuvev.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40174294382.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160882c737f201---wivumuge.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/61pgqhdut5jobdjoevkkq20g65/boseka.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zibero.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/dfa5b785edc768baa96e0704b0d4fda6/rexunugewuxodetezi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/80644459147.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f7ca6e77---30302696126.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/67051238145.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0492df27---60759852140.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/18584793600.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c9d94d3a---2139041560.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/dusofufetesoromilorugat.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gae14svgpv7hn3se9f3h5qrab5/87947407111.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593d86ac82---fexesov.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/274863m6it9rdalmmi6m24kkvp/lanogufup.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/febasopulusorezijad.pdfIn PDF document text
    • https://cape-electronics.com/media/file/97506707748.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/n362tk9sl3l051ecrspecq834v/38262698522.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473253c9e---44804193825.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983df3b50b---57834814447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=david+prowse+youngPDF link annotation
    • 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_off0001ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA67 17520 bytes
SHA-256: 23bcedfd27350bda515956e004033d0f3cb2025210c5b9593ed7179f91efaa28
font_01_sfnt_off0001f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21098 10788 bytes
SHA-256: 9945aa8a4d548dac1e7371b02f755ee9db4d33fe5a76ea55f644314b27b30c32

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