Malicious PDF — malware analysis report

Static analysis result for SHA-256 626098be4f4f1a3d…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 00:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: af95cbc7edd12ce4aa0aa0a960fad9bb SHA-1: 6f1e3ecab1b30cb1dd54f06a6d435efea58f45bb SHA-256: 626098be4f4f1a3db0f3e56e104a2c881b58647461987dee8766c72e24591223
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://struttur-arch.it/userfiles/files/83514956179.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2bkt9smqiuupok3je57dnfcjqj/19763165724.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/buzizutepemo.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/tukoxudise.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86226ade8b---32518084935.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5f5151684---74996149012.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7540f235---1961215919.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/rodenofesolixopoda.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/jolom.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dd54f7acfddcc491e6ed990088ba596f/38959055163.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/84fa1bc822745597859720363d19d2c4/jodavudukujevuxiwoxuf.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5d88fa1aba9edecd3e54eca2db1c26ca/33450428694.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beff90a50f9---44421971289.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/86831660231.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/39829263697.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/511ee4b10190474a2328757ebdf9fe4c/24223295260.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/tisoxojuguzavujewakarov.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/55620861067.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/muleju.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082fafb38bc4---12178286759.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/03fc1c24ffdd11651d8a413a92c3a1f9/12877991780.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/46e4np9jhnlftuerpb9gcfn8vh/wetunajofozaluluwepodila.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bts7vo6ftqjn0mob4oemed7pke/duwusijiduxirig.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/76045891350.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061322180573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=deklination+adjektive+mit+bestimmten+artikelPDF 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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 18732 bytes
SHA-256: fb5152b5e14e492fc44870c9319046c2077dc4b33e3384adb828775c2cf6fe24
font_01_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10840 bytes
SHA-256: ecce15425966c3264c1bb4af870055861640b790943972848538a610abe43ed7
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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