Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17c767509d2259b…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 05:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1cb0f494541dfee0cc8c678711b0c41 SHA-1: 5ac9f9f5d7fae5ec4180ecaac311d3265129345b SHA-256: b17c767509d2259bedce044f488ff219c89d4f08e904fb60550bef6f46bdd3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites, likely intended to redirect users to malicious content or facilitate further infection. The presence of these links suggests an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=to+be+above+board+idiom+meaning
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d3193625---27862996145.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6orun8rvglerc0vj7t6osjoqo/4164500818.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/47533207763.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jp6a44ablk49vjv5dnifnidi4u/20581686253.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/t6kc9cq1o1mi5mahqar17mu08s/69585672184.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b469a9b0bb6---jenorarudexobukarafasopoj.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vo0gqpcfho07vu6orpfpuoqidd/86221658183.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0eksksiaq6v59ueaobc0koofeq/48351890366.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2d0aea1244537e100f132064875cabf2/58717920885.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607074996dc83---fotosos.pdf
    • http://humanitool.ru/userfiles/file/zelesiv.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b0807d8b---20244305663.pdf
    • http://progfin.pl/userfiles/file/zibaneginuniguxa.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/146bc32139298fe1a4cc910e57b83aea/deruvokowi.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/45906827477.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/zitabatadigejigogu.pdf
    • http://cesishotel.com/res/wysiwyg/file/28256825431.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210616_7C054C84B522B182.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9ee445e---30016915504.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ae101824da1f4b16e07b7c18ea06254c/16265423182.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b2ce8cc---ropejezonigupe.pdf
    • http://langfordfinancialservices.com/userfiles/files/sabawotufoxegawisowotaze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88b.bin
591d600406e53ba128dde63105bdb162bd81b435dbc2b177879fe1d73039db96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 19424 bytes
font_01_sfnt_off0000f8b0.bin
ed628afc952f31c4bddf1e0b72040621773aa9bbd9c685f08d0ca5b1abc3c62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 20948 bytes
font_02_sfnt_off00012d3c.bin
b6363f5094df5acf70f9fe54616025ff2443495b1e623cd222449cfa6ba26ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 10448 bytes
font_03_sfnt_off000144af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 16792 bytes

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