Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb61cd989b0ac52…

MALICIOUS

PDF

65.7 KB Created: 2021-06-21 00:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9d913db81057a0ae877e5d68d4442f SHA-1: 0b40a6199784e393eb1e6529f283b4383df465d8 SHA-256: 1fb61cd989b0ac524dd15ed663a110a2d93ae86d6ed218d873a29906d84807ea
164 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ea2f375905e10b496ea7fb704a61987/47024697247.pdf
    • http://albino-pitti.com/pub_img/file/2832380714.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/50b477cb4d0c75597dbdf7bf6421c09c/16826295563.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa6ed6b502e78d262975d1db18e6311/2354821731.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4926ab925003da34dd26956438e67733/lujadogipukexidekexovum.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/l8tnaleq279tbuh9adm7outcre/memativuvidewidifuxo.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ff535333---31103245479.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963374aac00---75205598505.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/92c285e65adab16d7b18acf8074b1f33/56263269222.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984648134b---60245714255.pdf
    • http://slsnn.ru/content/file/7915782571.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87c9d802b---93174791905.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428212640749764.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc7f06743---94688150566.pdf
    • http://rszm88.com/upfolder/e/files/20210605051907.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e8fcc4d9cb080339a38652e24e6c9031/15245859762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=64+in+1+nes+classic+apk
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b93d.bin
cc818ed9a62ae2b794c5d06e5d452725d30f412bee07a7203a6ca420bb733cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93D 2996 bytes
font_01_sfnt_off0000c400.bin
211b7f88081b4f114a40d0d08ef780a519a3607ad15c317029f9cff8fa825879
pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 5096 bytes
font_02_sfnt_off0000d577.bin
547730104d508d4c66c7a65d5b269ea70aec85d926effcead9f252f1aae875d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10568 bytes