Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f54fcb497066aa9…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 10:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7058aaf33d8f359130ef1b4b82b17196 SHA-1: cf0c796afb821f34d39fa33ed54ecf296c2a0708 SHA-256: 2f54fcb497066aa9d23544fb1e155fbeb190b84c04381f545b820c0f4caeec0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'pdf online converter', indicating a potential pretext for the malicious links. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://crewmak.ru/uplcv?utm_term=ris+to+pdf+online+converter PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d118752a8---jefamapudimaduk.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750311b88b6---36982182198.pdfIn PDF document text
    • http://jump360.co/upload/files/20210604155154.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zewanuratenaxif.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/64565606821.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/57371795413.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/47928745775.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d21a92fb9---11328849041.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f5237b6eddfb99a4896877f8e3a078e3/48095419102.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/73055373636.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/86601038595.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/51425363153.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaf20ece7---929710133.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026d9a162e---52022916845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5008 bytes
SHA-256: 92fefc7c9e6bff696466e4272e17ede7355f621340002c6c5ee856da753c195c
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 11180 bytes
SHA-256: 714acad296125799b1dbf305b12d4e88ea11880ab41eb607027327ca72161abc