Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89bd308c7b3032e…

MALICIOUS

PDF

82.3 KB Created: 2021-08-17 11:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5af1b110f83a022652624965c4874cf6 SHA-1: 0de57751d46a18f1ade15410a8480c5954a2fa9e SHA-256: f89bd308c7b3032ec8296f4925bd3b657dc730608030cf15f84d9c050026c316
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming its nature as a link farm on potentially disposable hosting. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd5291631---30092687065.pdf In PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/37281800166.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52542d9d6d---wejedogokiwasodozojim.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/8070196634.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/nupupufijoximo.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/78993087984.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d0acbf9b---5566467255.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/gibutugogisen.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0549554e---dinamenebopenub.pdfIn PDF document text
    • http://bwc.lt/i/48188407809.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/de8259001dd15c72420dadcb736ac97b/ganoki.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ah88pgl7e6ov21l0trduf47n02/mugodikezofusaje.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2pjjh71vhprh7hr6dijo23icd4/36438893367.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/22175c0b0968120eb1ba2ea8eeacb224/66367456538.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/84932164586.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/51484824238.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/nazimepilomujipemasu.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/silizifeb.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/dozijalinasotaxikenuv.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/ruliwag.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/niwatop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4e4e7857552fa732502f5c644d1e8933/87618749822.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de8e67eed80---lobegutiz.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/kipenititivan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=devoir+surveill%C3%A9+maths+tronc+commun+biof+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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 11348 bytes
SHA-256: e664ad8ffde4af273c709ddb8cf3bc761606de22c2568aa7aa327a05494d7b67
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 18372 bytes
SHA-256: 23664f04d0abc502fc21db3ac33aa425bcf7023dc0bae2e8f07d0439f1b50c80