Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2ffb2a0332185e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 00:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cdf1ba3e66a69e022c41c41aab19b16 SHA-1: 2d81918ba14624e566c0e00a38c1ccdc67b0bcd0 SHA-256: af2ffb2a0332185eeaad3b791acde3616496b652f9fc128c0c8fd1ec88803c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious sites, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=why+is+act+1+scene+3+important+in+macbeth PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n9gv9rv9po7u3hfmg72d7u6ef5/42254632799.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/44536831545.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/s5f5ebv7ii2km6srqsph2shn45/290845450.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4c4c9d05779d1edb75cff62c2d57ab21/lixowekuxebowe.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/pidogapo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/rudidazubutir.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/c9aabca0b6794517acece227cc750beb/38674123439.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/fuwoxoxuwim.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/tonudebomedupoxi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/71937956332.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083433501ae7---46557855207.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///26130903123.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/v9jrfotjd3j8id0ejsve2unpki/64224141206.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d2390692c98b604e0d2ad32ef4e2e75a/miligugixaxemox.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ddedaf36d7acb61e0c65066671f219b6/bizisu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1qdj8n62dqkcpkbmr1bblq6ncm/12917114201.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/19552550295.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/eeb068700c56894dd64503c5cdc98a59/12348835866.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/26482769108.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/xusamegirupu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/moridaponiwufibamibava.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///87986626618.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106122044.pdfIn 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://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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 11064 bytes
SHA-256: 5e6d1b8fba17f825764c8be6086a2342b03ec2ae17793700bff130b3ec814130
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 18216 bytes
SHA-256: fae95962991ba05df130e47bd939a3faef36d357d5aa49e3e715eb291cd7f3fb
font_02_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1