Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9aad804cf18d7f…

MALICIOUS

PDF

81.5 KB Created: 2021-08-02 12:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6085ad9210629863e57a777ccab6859 SHA-1: 5cfe7d623ac1d023f7d79d1b8cc24e3fa4587a18 SHA-256: 3b9aad804cf18d7f4f31d52ca71b7c1abc63c6b41432425e4d3cd7001c801426
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs increases the risk associated with this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qte46fmh4am1trrkqhldnpf145/27934628225.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ede546458224c9021eae0fcdf0925877/20034125529.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/zikefonogipex.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/62568355229.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/niwazujovixosaxadaloguw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f655491de---romajeteve.pdfIn PDF document text
    • http://hanleyresources.com/images/lugirax.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c385dbdce63---fetutafexodijifodi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119fccb364.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c430b1188eb---18490595784.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jisetiguzetaworuz.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/sirufemi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/niwab.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/nudadudovumojejexejek.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/15707088643.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/29535091957.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/zipasewuda.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/85661757435.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/piwepujusub.pdfIn PDF document text
    • http://m2m2design.com/userfiles/94189409788.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/zawukepizaduton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cadd+legacy+pump+patient+informationPDF 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 11040 bytes
SHA-256: dfdf306871a255745a7f633aab76def1c1267755dcce6d9f03eb4f8ac4f2bce7
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 17816 bytes
SHA-256: fa7708ef89b8f479858d44e6fddc1198554c40e0e2e22329d52f7a4d993853fe