Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aefea0ed3b6f49…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 22:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 751bb4b8e8f5bb69508cf27fb96539ea SHA-1: dddc48c5ac67904fd76d4d51c535ea0916fa2db4 SHA-256: d6aefea0ed3b6f49dce1c3d564797b308cc80656dd76cd393f0018d841737b91
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites and compromised CMS uploads, likely to facilitate the download of further malicious content. The presence of numerous unknown URLs supports this phishing and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zerosquareonline.com/file/dubatexegixarajojurut.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/resupamirofug.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21893c085---degerutovose.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/78501716491.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/76809222049.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/17695609475.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/17772870977.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/34438160654.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/jetefifuvo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf8e3e5e7---jomewabaxev.pdfIn PDF document text
    • http://liily.jp/upload/file/20210905033031.pdfIn PDF document text
    • http://potlista.com/file/files/34336652183.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/51576931320.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pagaderoso.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478371d77e---tufopevoja.pdfIn PDF document text
    • http://totoumi.jp/upload/file/pofiso.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/63507803750.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/lixivuredirudin.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/67222139709.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nifukozutog.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/96327977085.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/jogevil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dream+league+soccer+apk+and+obbPDF 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_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 17888 bytes
SHA-256: 33fb62b49f9f7d619aae31158b9aa2f8e6a0ddefdce5f7a31af5d90db00a90ca
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 11000 bytes
SHA-256: 38a30d9a11db0be3fe72e8b95cd895d22e3bd7b75696f0cae24fdb21912e548f
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1