Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ddb76188633c4…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 08:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1cc38cff26afeb705ae5b40d941a22f SHA-1: 2a96ce8a34a6c02c5dcaa92ec20cdd96814d2f06 SHA-256: 8b6ddb76188633c4cbb09372d36e1f23e052a4ed37b3b0b5517b7b110738b33d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on disposable or compromised domains, designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=easy+drawing+of+soccer+ball PDF link annotation
    • http://hrudolf.com/userfiles/gudiloropa.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/58503151641.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ziledomowivedepugoloxu.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/75201029764.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16157905364eee---laxuxogagojadusiz.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/58320973885.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/lafunopidinewatu.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/14816301968.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4e6ab4d6---kosukenuxegilijopuzulejow.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gotetozemajozemak.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c5v03e102dcvqo13rbl5r327j0/66456893155.pdfIn PDF document text
    • http://chinalabware.es/d/files/jowegopasaxazunalifonunil.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/46008827496.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5d588d2f---50330064456.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210919025253646871.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/didenewubujuzapasalorid.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/5716746705.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210929012903104996lcoe4.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mojovikumabifomiwiwuzata.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/zalisopaxijodawovuditowo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fuvulinedetujakaguxejo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/64341027767.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31618221745.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/87944118944.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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 10876 bytes
SHA-256: def2039ce099ef231d351c5c4625df241446eba492ec6113a0743853414c7e64
font_01_sfnt_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 14500 bytes
SHA-256: 23741c203a227e59ec143a28042097a6e48c04daeae6767d6f14170bd90574a6
font_02_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1