Malicious PDF — malware analysis report

Static analysis result for SHA-256 b942d0b6c483d85b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 22:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 882f761c20c3a07422c7ad5b5d143670 SHA-1: 515a3b82ca6d5d2ac030157a835dadff95b32ae9 SHA-256: b942d0b6c483d85b17758dc3631608c485a251a59c4bc16db5d5b0b1bdfb32a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to deliver a password for a separate archive, likely to evade initial security scanning. Numerous URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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 http://inspirationforexcellence.com/clients/66491/File/lekuxadokovili.pdf In PDF document text
    • http://zamdq.com/filespath/files/20210813031744.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pokarigiju.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e5272c214027cb225b873881c90c48f5/gimuzavaxotexatonepive.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/lisidej.pdfIn PDF document text
    • https://duvanco.be/docs/files/viromavibipubuf.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/17674602917.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/fabafunew.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/78187047599.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67891995442.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/beb363d12dba62dbafecc07316fa1753/jejababusufa.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/2857305488.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/097d6c1d2c82d7dc0735cdb12937ebe1/15896614775.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lifijososolafeta.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/kesivupan.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acac5256304---sakabo.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/xawaju.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429ee7ec57---beruve.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/absvvj36p9bd8l0049nldj3qv91r90rs/96697381923.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/gelesuremoreminib.pdfIn PDF document text
    • http://zuche0551.com/upload/file/91534693883.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a14b18bd7a---tejixojezivemejasudabu.pdfIn PDF document text
    • http://st03.it/userfiles/files/xemowodu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rovomoviboxexorepofa.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/24700238269.pdfIn PDF document text
    • https://digireg.lu/upload/situg.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/99048951470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=flipping+book+pdf+freePDF 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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 20200 bytes
SHA-256: 631e005e6dca5d21ab114ed50709718f8f8eb9bc16e8e8149408b461ebc316ff
font_01_sfnt_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 10452 bytes
SHA-256: 749d0408c03e5cfd5a6fbb647d73876c3b180a6f9cea4a264f8ba862ee0f3d8d

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