Malicious PDF — malware analysis report

Static analysis result for SHA-256 80783bfdfe6c798f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 21:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3448312db2138d36c63b5a8d045ee9d2 SHA-1: 94e454bd6f7e51b089e0a1846111d9f07d9aa21c SHA-256: 80783bfdfe6c798f1cd623c1ef1b7c2c9a959c2f349e4dc759a4c4d4b8f0cab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many hosted on compromised CMS uploads or disposable domains, suggest a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the nature of the URLs and the detection names imply a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=tubemate+apk+pc
    • http://iberryhomemade.com/userfiles/files/pepubitani.pdf
    • http://footstepfloor.com/upfiles/files/voniwikopikuvek.pdf
    • http://shinies.ru/img/lib/file/98415239151.pdf
    • http://meteosputnik.ru/userfiles/file/bajifipimajiwar.pdf
    • http://tcgardening.com/userfiles/file/2021091812302773499.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a9420da0---99077483957.pdf
    • https://aymsoft.us/aym_image/files/paburele.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/fhe507k5p37409uv8tq74opovo/50362409695.pdf
    • http://mtt-association.fr/upload/file/fejivet.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c3b2efcf14177b0f290a2199c31fdf74/13742150582.pdf
    • http://baloneacessorios.com/_upload/file///pubanamibononiwamedewade.pdf
    • http://methese.com/upload/files/408038481.pdf
    • https://candica.pl/ckfinder/userfiles/files/modotudokevukobopof.pdf
    • http://abwingsbuffalo.com/uploads/files/zunasus.pdf
    • http://packturf.fr/files/92783285803.pdf
    • http://colokit.thienlonggroup.com/Images_upload/files/52135074050.pdf
    • https://aronabritcan.com/userfiles/file/xonipibuxukibiwakirud.pdf
    • https://grouptm2.com/contents/files/78065468470.pdf
    • http://breakevenpoint.pl/uploads/editor/file/38294289960.pdf
    • https://granitnet.hu/editor_up/29949702148.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///zeziramapave.pdf
    • https://snqrsl.quebec/upload/editor/file/sukasupeligorabazitode.pdf
    • http://rowadalbyt.com/userfiles/files/29273188089.pdf
    • 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_off0000d6ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 16792 bytes
font_01_sfnt_off0000ef03.bin
266d8a30c1c193fe5dc385f6e6c45bc848b76d06307f5cf7bfc4a25888da5f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10200 bytes
font_02_sfnt_off000105c1.bin
ba1a7a29a2980606b17bb7a6011a3295a4351c26809233eec7195f7d52ca02ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 17888 bytes

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