Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be263466d050654…

MALICIOUS

PDF

111.3 KB Created: 2021-08-13 19:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 204887b8646adeb5c4d49e5c171a9431 SHA-1: 7d6ec83f054cf7c593ea03888fa5c1bbc7ab1b31 SHA-256: 0be263466d050654bdd6764f0134f598218eeb79be4462cc7c2180d3e176338a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://efficientinfocomm.com/ckfinder/userfiles/files/rubipemufegaxusin.pdf In PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/10210223665.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f31b9a7aed---weminuzi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/p3n9r5uk3muv1am17bd9ova62k/gemeriwetegit.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/74674113320.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e012f8a7fa---49908887435.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/29751402567.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/46977548505.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/42784417391.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216ddf00f---duxamibipuwibirab.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b1fbf89f20bb0be982783f540d967b/53851894816.pdfIn PDF document text
    • https://tcremich.lu/files/files/60154750839.pdfIn PDF document text
    • https://goodline.by/userfiles/file/26005448821.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d13e38918---57180752211.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a250d2a2233884840738d96fbe35cf69/tujimixomaxif.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/838371370724a09820358b2a88b21edd/rujesebenuzo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/80618113596.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/borusizalekukuwuvi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124d1ab8765---vavateran.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8b2f16588539d5b050d2c811cd6e8b8a/3357814052.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/11976005431.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e963ccc57---79495544588.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/zixadetonulizusidu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/niwasupexaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vitronics+soltec+xpm3+manualPDF 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_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 10880 bytes
SHA-256: 8899343fae6b761ca8fad24e431371b39dcdf88541915e15b5253e9d8e2e83fa
font_01_sfnt_off000169be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D0 17108 bytes
SHA-256: 4e2341fab0ec0fc21945c9dd7134512718ec17d8c346c8c690325888761f00fa

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