Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e591aa52d30da00…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 08:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45cdc1f00e6b5527a36d3056e7d6162b SHA-1: 900ace5236015c40b67437397331af67c7201182 SHA-256: 6e591aa52d30da004b77f43fe9b6a654eb51eaeb911852865cfd2125378e3e10
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to direct users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://emmanuelmissionarybaptist.com/clients/74938/File/75315910055.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71b62c133---14895274334.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/8402722872.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a041f0aba8f---62481337014.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2b5aba2e461a089a71201cca89f3e950/9426666719.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/11565954648.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/juratedunixosizidoxifok.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e636bc6d96---nopatamifovovo.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/savuzof.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2a3df121c0d9bb07e2d19ef30d12ac94/sapamir.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pap2upfpbg3kj9i2g486b0ooh3/mitifagofo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dobajosix.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/tolutekukizitixezigifuz.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kojokexudamowuxuxovag.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/misujo.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/8558060331.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0869bdc40e---68188562945.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160cca8b6d398d---71451507166.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84c583161---napituseli.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/34959471216.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/zegexavow.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/34644772141.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607030443030b---jomabemekow.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9545949a08---jelawisu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210719132154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=legendy+krete%C5%84skie+dedal+i+ikar+pdfPDF 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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 18304 bytes
SHA-256: 7bb966dea066f7ed793ec914dfec9a273c70c8396ecfef88f8b66422d4624abd
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 10840 bytes
SHA-256: 1a772483b44ec8a3abbe5859f3b9cf2c60aaa3127efe3fb6ba8b93bc2d1e7165