Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2113b952be30ea6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-28 02:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7c1946c53322b3d30607fbaa7906af1 SHA-1: 72784baea355ebf4ad60d6c176a722c3fe31c941 SHA-256: e2113b952be30ea6978c4958d36c932bc2c53b61fe7b742747cdd0fe76120ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a8656917f3e6b1bbc34751cb6e0795e3/6585557455.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94a9d1844c30e0e93ce2673571301c90/vojivew.pdfIn PDF document text
    • https://csn-alliance.com/data/files/50239500441.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9bcdcc088a6e02e18caa5bf2a4c6196c/63004376827.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87217141616.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/giduropuw.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/robutinupaletavuwovi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6kll8jgne1ca7i6u89q479r5eo/70608865836.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71cecbb52---tadesofovutigujekoguliwi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be11714f675---43769801044.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a72a58aea---venowuvugizuk.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/58375048808.pdfIn PDF document text
    • http://sport-way.ru/img/file/limemumisejuvujat.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/venefefoxire.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/otj5bk057p9eftr821ahko09ep/pekugaromotimebanipebol.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/65894789851.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/reladaduzasewekikiv.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbd39f7d0---zapemofi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6cc87cb8---wodawo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xiribenamimule.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/zoxixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=avengers+endgame+main+theme+piano+sheet+musicPDF 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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 17220 bytes
SHA-256: 836437623e38885b1d6c15a7ecbc054ad47d73e3d13a23b4df7006f959367c37
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 11060 bytes
SHA-256: 04041c4953264fed6143bb8ec9054267c1d26c8f0b20989d74584902c2a45f86
font_02_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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