Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ff7fdcb62d8d5f…

MALICIOUS

PDF

82.7 KB Created: 2021-10-09 21:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 367009db54fcd63cbf2ea9a12b3d069a SHA-1: 5d1b85ebd8c282089434f9de5b74fac1a97fff8e SHA-256: e7ff7fdcb62d8d5fabfca64421efa2c374e22a782f7ad4ad602c73f2c41b2cbb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pusancard.com/userData/board/file/4604555110.pdf In PDF document text
    • https://elegune.net/files/galeria/files/39931191353.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zogepopu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/27257172102.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/figotawefat.pdfIn PDF document text
    • http://jadeite.ru/images/file/lotalo.pdfIn PDF document text
    • https://uangraja.com/contents/files/8259127387.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/98720965745.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/99172508275.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/88723351991.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/17122132718.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a36aeadc4ce5fe86c4352be3ad4e9582/6226637764.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109200258345290.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/bilanoxuvu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433dbe03748---wutajomuroxepevarudowozof.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/46237461327.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16780484142.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/japuzososaval.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/74509787650.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/88322825455.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/43c4138ufb84qfh5trorhkuums/fakimuwubinevotori.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-23/20210923194347679353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=poe+currency+flipping+botPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 10680 bytes
SHA-256: bf68238012826a20f36bc52a53564df699be0fe5fc596eab8969c70c03ca1402
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 18636 bytes
SHA-256: 83435a4da837b22abd2eb9ac0fc55cc9201c0923317c2191c9a887836d9c6474
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1