Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d44efe236c99bb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 01:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7324c33bc983f52572e847816b7a214 SHA-1: a14d0967978727c1cc233bd390bd23e9f4daccae SHA-256: c9d44efe236c99bb55f7a0e8086f16a7c731d4395ba741477be49d94ba75408c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites and disposable hosting, indicating a link farm or phishing lure. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the PDF is used to distribute traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/nefiv.pdf In PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57325074933.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mgp3iq2jhcdprcjlrrpi67n8n1/44707910747.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/v22eqjppm7eam3h4hokbkc175c/dufezolajiwozavep.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/90891494068.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/61904771581.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/bemosojemukiwiboxinem.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/segotinugilopaj.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/59280168677.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/33654985955.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/85f0d7d85bc7f6d774f899c14dbccd4c/govabowiduvijetan.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7169126f76---7356214683.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79f2c30368---41072902948.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fcfc0c28e3965e974888bb8da990f631/fefatipotogitere.pdfIn PDF document text
    • http://skisun.it/userfiles/files/tigawiv.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qib65nfjk2e69to81lh8bpl932/22982158850.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091917005c7d---85569551297.pdfIn PDF document text
    • http://goref.ru/files/file/kojaka.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/82523913728.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051214174780.pdfIn PDF document text
    • https://soechi.com/userfiles/file/62868629735.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vaxigapojoxurasofopiten.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5f7b422---857400322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=2007+dodge+charger+service+manual+pdfPDF 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 18092 bytes
SHA-256: 51c6a8a0dd07fadbd6be02f1b93512079b73da99617484e5c205556fd9cdc963
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 11332 bytes
SHA-256: f9a71953296fa2f75eced291af087ccd0d199f639f0ac87a6b0e952472651f34