Malicious PDF — malware analysis report

Static analysis result for SHA-256 de462b32bbf9059e…

MALICIOUS

PDF

92.5 KB Created: 2021-09-18 19:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a88c46ff9b07444c6a094737e93aa29 SHA-1: 955fcb50c42068bd21d4df2ef73a87df860e6ba2 SHA-256: de462b32bbf9059ec40c58fdd2fd129b986dc4ccae383d1a888e78ed1fc42703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://himarco.ir/basefile/himarcoir/files/zolemo.pdf
    • https://cemb.ca/upload/editor/file/43486485888.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/59146890754.pdf
    • https://nhanloc.net/userfiles/file/11589271314.pdf
    • http://boxshop.mn/userfiles/files/vumumiju.pdf
    • http://knuhpharm.kr/userfiles/file/20210909065140.pdf
    • http://izmirtavla.com/upload/file/30710322949.pdf
    • http://alnadaoil.com/userfiles/file/1525973274.pdf
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/movuzapadezozo.pdf
    • http://kuppersbusch.hu/userfiles/files/gidix.pdf
    • https://ms02bet.com/contents/files/43361763912.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3311985---59494227866.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36eec73ee---38852402009.pdf
    • https://chennothinterios.com/uploads/file/346235803.pdf
    • http://hodoan.net/userfiles/file/pogetip.pdf
    • https://samowar.ch/upload/file/pabobolipipewokatonogase.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d0fvg2jp7qrjs7nvlvlnlq3np5/kowirewewe.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zogafegulubuludanofulomut.pdf
    • http://meubelenindex.nl/images/uploads/12335845270.pdf
    • https://padservhosting.com/userfiles/file/zasodafagejegimurofo.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c58b080623ad178a2025db89525f257a/zewasavopejumoruv.pdf
    • http://tentauto23.ru/ckfinder/userfiles/files/jovikazukavopaso.pdf
    • https://mediaskills.rs/files/3641617823.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2957a0c---nebatobaxed.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+vampire+diaries+book+1+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b5.bin
005887139f48fa9fe11286ba1b8a3e00760e76cc686edf3a60d4270d35707c85
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10828 bytes
font_01_sfnt_off00011d80.bin
661bf1f11caf75f8a855448b642561083980c4e6a896cff0fb859f0fdcae9cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 18204 bytes
font_02_sfnt_off00014c11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 16792 bytes