Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f86f4f946998df…

MALICIOUS

PDF

92.8 KB Created: 2021-09-20 20:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41b6b191104e8578f4db8cff71bda13e SHA-1: dfaf86d1a29408344d236bf9816067147b6f5f9a SHA-256: a6f86f4f946998df0d969b33fbe23aa056a59ef1e099bfdfa8bc2c204e3989a4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to host malicious content. The 'SE_MFA_LURE' heuristic strongly suggests the document's purpose is to harvest credentials or abuse multi-factor authentication. The embedded JavaScript likely facilitates the redirection to these malicious sites or directly aids in the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikuma-car.com/js/upload/files/96945244584.pdf In PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/73743566054.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/478784145.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/gokexej.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/namevupetol.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/95795765985.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/20760697759.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5752bbc164a85349b069010c14d726eb/95653141567.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/78457573950.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/lirukebaxevir.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/jenibonimonifekesugi.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/67055214687.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kixewopejim.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wabedibutujit.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/wanituvu.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/33279348415.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/73856633453.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/98029955347.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hb06depagl4i2cs5makh0r5fkb/61955151787.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161380221ef6be---vixutoga.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ketisivevuwobolusukut.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/26642993011.pdfIn PDF document text
    • http://ingore.cn/upload/files/8932445647.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/vuwixigolip.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bajijufufamefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sms+secure+androidPDF 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_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10564 bytes
SHA-256: 253b64b68ef25c13cb4a010ba45aa6fee77c199a30c2df03b148a29bee46d0ec
font_01_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 18056 bytes
SHA-256: 969460feff2b66d672bc111bd2d1f079ad6df08c78cafc7bcab8a69b44dc7f97
font_02_sfnt_off00014d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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