Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f91403b9f0cacd1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 22:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c1fd2fe032f895e696c3c8dfd6bc09b6 SHA-1: 3f53f08952aad32039f7c986978f3deca92efe48 SHA-256: 3f91403b9f0cacd10623ab95951b88dfac2df1fa5719f5b2d42a230f11f81536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bb0df7a7c5f247ea38234fdfa231a876/milikelutukosiwu.pdf In PDF document text
    • https://szallas-karpatalja.net/upload/razutexalunejep.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2d3bdb1---rexerujojudalu.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gipogijorafeji.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d83b74f06---76319405573.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cc2eac282db30672ea1ca92e8665d800/nowizovatuloweluve.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/iopq1i336a6pse9qdg92drhhnm/ligaxutobepuvas.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/25937391037.pdfIn PDF document text
    • http://vhshf.de/File/kagasudijipexegapojek.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/fogexafusidikexinirobirum.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b749a388c40dcbcabef0dd4be0b90cbc/24759493019.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f360be4536---vanovesinelod.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dujudipurejonazi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/43453688743.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/jefazefewa.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99184843883.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/34602982892.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/wapavonigodukeli.pdfIn PDF document text
    • https://samowar.ch/upload/file/bedufafevuxagoratumuni.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a5bcb826f9e2346f0ce92f75c5c6d1f7/livoji.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/52774353601.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/wekarikotinawuga.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/533873421af7f74c9b7ee1ec69561625/97558462306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=franc+suisse+to+cadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/getokajuxafalulemat.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_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 10396 bytes
SHA-256: c11f758e274e4e4b6c8a561d627bd5b957907b3b0ff5a7fd7ae3d72cd5ffc3de
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16524 bytes
SHA-256: 3c53d3a7b26908ce215bd29904a7ad87c61399bee10d9e3054583d9b33fdbd1b
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1