Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fab78f81e659f2a…

MALICIOUS

PDF

73.7 KB Created: 2021-05-09 21:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 689c015114d0d996f2a178cb26811a06 SHA-1: 62b1bd78313bf4dddce46f0ac815b13a36d2234e SHA-256: 6fab78f81e659f2a9b10b7b3a7580c8abf10557bfad9213e87a0fc8fc5618110
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5c4a6834ccd3a68aefe3e0ecdd936a4f/13902023290.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7c6a3db5---64141955625.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e73ed3d78---sumini.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/912714a80d955dcda6f659724a0ee50e/25092173445.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3cf0a2da---zuxifibivew.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mso67snpvvj60lb0cgrg22r2lk/95528506143.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7fc99f9---dikorobakumedozadu.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d23672900381897b249ff6bab77ebf4f/18906022684.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710930658a7---gevasikoj.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841f36c0bfd---xenunetej.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdc1aaa18---tisupikunazebirasen.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094adc37780a---66489068902.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776803873b2---46924165489.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957a5d82596---koxulilanewinomamogufij.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/50c8afcd9439bdf33417ed00c93f0c1e/jekubeledesotigabupota.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737299e9142---lomoniwigobefuxokapek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sony+vegas+pro+17+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e306.bin
57a61f419872099bd31aa0cb091cf5672fc0cce3abe95f73ead622bd6ce08a03
pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5436 bytes
font_01_sfnt_off0000f5b3.bin
2d4993c222d364fe4e4c48327eb3101d936ce4634512992b25b0bc20a3a5baf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10568 bytes