Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccfbb9d71d7e5d6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 06:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b58a3538a75c9c4091a7251ec08e00b SHA-1: 43c8bbfcfef93d913710a35bf6b255bddd7c9c94 SHA-256: 7ccfbb9d71d7e5d6949648288a84ebbdb5830b7995c4b669e4be72498c0c4927
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sanyosushiglendora.com/uploads/files/kelotatutidixinisulomovof.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614688616e649---58074931308.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gotit.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/pemuvesurigexefojob.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919022205.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/nutenodelodexovagemiligi.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/21445805151.pdfIn PDF document text
    • http://julianina.de/upload/file/25180492249.pdfIn PDF document text
    • http://cold.lt/userfiles/file/9737971876.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/xepusukegamukupor.pdfIn PDF document text
    • http://talleresjpg.es/img/file/85504667407.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/datemuxogev.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/67189361923.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/46590480280.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/dobemabepiniz.pdfIn PDF document text
    • http://domario.ru/userfiles/file/71507829752.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161452e958e4db---pilepafexu.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/11152614267.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613923016c3b1---motapuwa.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/satekis.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/94466815382.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/48256816919.pdfIn PDF document text
    • http://apart1day.ru/file/lutuvigibolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=image+cutter+for+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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 17436 bytes
SHA-256: dc414cb6e197d40ed2188ca34ee486d5a4c27c26796b95e032ebbd9958c68a42
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 10656 bytes
SHA-256: 612a78cc7e0bf65308e547850d8d88fd21834f2e35b8d26f56230ea763c97fba
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1