Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f955f223893e091…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 11:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09807aa0aa068d22de3f2868c48b66cf SHA-1: 22cee7d87a06e1626884634ce85092c67ffb11ca SHA-256: 8f955f223893e0913e273e9fa0303b03bfa44301e7cadf25f60d48cc3de28fef
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm within a PDF document to lure unsuspecting users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://abwessex.com/uploads/files/79999010201.pdf In PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/69482143811.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/41222988604.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15acd28a---bolulorareresuwujit.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120323395071.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b78bb171ecfdfa4c04ff484a7550da9f/91096774304.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1gug4e8pvuunj73c9m7rl0fkd0/josuwubadebamife.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vunitigafodaxafinoko.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/46436094841.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/69788047932.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pjpteapd5p5v5p797th5np9kvd/795015509.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/jididubivuxurobifi.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908030812.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140d35eaa377---41038825750.pdfIn PDF document text
    • http://halaljones.com/uploads/files/54686863723.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/betubegisudati.pdfIn PDF document text
    • https://harom.ro/files/file/4629475164.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/27693648970.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/wifevimovagotimilekaze.pdfIn PDF document text
    • http://irinabailey.com/upload/files/dakibikubelumo.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/35595158289.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/77459477072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prevent+overcharging+androidPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/gusezuxebetujovunezes.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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10500 bytes
SHA-256: 2f87fcd9362d8c195e151b5d0e6625c7f75b07ad8e25b8f91444c0fc623ba509
font_01_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 18212 bytes
SHA-256: 279842c3aa97695bb2a9ba27f40dd254a706154b50de3365ad43bf96e1869a4e
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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