Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cef803cf5d1e72a…

MALICIOUS

PDF

69.0 KB Created: 2021-06-21 20:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b0b62a10cb6031c34c4561290c04fa73 SHA-1: 1c0a29ff8ff1b263dafd5ae819758b6cc08e3ec7 SHA-256: 7cef803cf5d1e72a566c9e33792a076e076bc5c894838bbaf64bd7d31d2bce6a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://chcial.ru/uplcv?utm_term=jacquees+2020+album PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h7h8eq1a20k8ndu8bs1r3oegi/71552074311.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/21062380956.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806cc3c952d---viwevi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ec6145ff54900da6c2f6a77a29cfc241/12216797674.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f05ecfeb6---romirereseriburutunajeba.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a22768dd5cc4aa4a2b7c2029d6e15596/30440249378.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86295071818.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/321eb8e473d0ce93111979791b76d1c5/26259671472.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/a77m3i9ofsusoe2ibfkgel05o5/20813811732.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CB3BEF56B75.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/jovipitetazaje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57fe8a10b---14930641725.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaa4a1543---89675329813.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gotigunemanix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d59f1442---77500270589.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/lufatemedoxovavumok.pdfIn PDF document text
    • http://www.bash.cl/media/file/gezuwowozuxegofog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 4916 bytes
SHA-256: f16bc27319e39ae4498df32580837f7441793409f254fcb558fa4b81c2054862
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 10980 bytes
SHA-256: 244951cecb9d16158aad644b7e66e2be2b19e006339d814298c89f92e7294fca
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3