Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f8582d341aa6e0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 07:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2accefa697d483e1aef9caa6049d6534 SHA-1: 871773b7d9ed1d851e6115f1105b40cd5edcdddf SHA-256: d0f8582d341aa6e044e64801d443b437baa0f83509843bbe11d6ac1ab7651340
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bettynblue.com/upload/fck_img/20210508/file/57420427950.pdf In PDF document text
    • https://masihpt2.com/contents/files/zasitomenanilimit.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/faruvufeluv.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/57244642398.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/13297463366.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dozuxoletafokufative.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/6172139996.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72eea86dae---91262059663.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/41499305102.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/56514948883.pdfIn PDF document text
    • http://plinoxotar.it/files_pagine/file/tivetoj.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/solivozawojunoli.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zabajazuvitepofilamo.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/puzefimimoz.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/1474868570.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zobiwuviliwumuwi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/98786833817.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/61115526036.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/47746379268.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5769a80dd---17973040988.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/13800631139.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/98770861246.pdfIn PDF document text
    • http://safetruck.gr/images/file/8449434125.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dde092c06d8---65134630145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=basic+acoustic+guitar+chords+for+beginners+pdfPDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 11144 bytes
SHA-256: 30c405459a22f4206ce98b6f486853d83032c9f4e9e4ff69ee8a3fae3be6ef92
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 18100 bytes
SHA-256: 9a8d6b4914666638a85466b72fa2f5bcc7ed5136a3b9eac08ac44d50b23e2aa3
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1