Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8dc953cb63ecc3…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 18:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4bd7b6970122733290de9127ef94ca8 SHA-1: 9748f256121f09c3623698d68bbe3223de4352e3 SHA-256: 2b8dc953cb63ecc363f2373b7967c4e033c72696770e0506d824d52e5119b65d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://transinfosoft.com/userfiles/file/damenadiwikuwa.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vve20c90u8m64tnbd4oqj1m43h/19960521428.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595150082a---69835159347.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/resupavekogeguvuwagito.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/01f066d95a6efcb6f6b70e2ed70dcdbb/61817421924.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c782c2a6bae25a731e52a7fb899a1d00/viwinulikekunojipu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913b426a74d---62327908434.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/13073975522.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cadb3baac7bc89d29c982439205cf7ed/58471249718.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gm13palnuk0evcdoo1np2851f5/21720056296.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/88107011006.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/44135707744.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c33ac881136baa3d77ad17669d188f5f/bezul.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216101123236287.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/60439241926.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160834e0ed5ec1---lowibisaruvawuwedakurame.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91789580132.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fa266fb1---93794259446.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/49542500505.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/850705847.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qqrif5n11ljksm7idob31ubvar/34626116091.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/80065906384.pdfIn PDF document text
    • http://heizler.hu/files/file/76196771825.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f6fc412c013784ac2675dfb30e05f3e7/tunidusategagagidesex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+reverse+fault+is+one+in+whichPDF 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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 10668 bytes
SHA-256: 8aa8a37b8fafb2bd2c397fc01231e8c3d09bf10d17e30d761516151cd80ed58c
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17408 bytes
SHA-256: 7455ed89d248a68991e26e3eef53b4f93fb716dd7138f4d78b7b3854614cbabf
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1