Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96e2006fab919ca…

MALICIOUS

PDF

103.4 KB Created: 2021-07-02 01:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7efadc508879323ad55d6878a60f8616 SHA-1: fc166a3f5e19d7e51faff862e8f18f9435d4b213 SHA-256: a96e2006fab919ca4a9c2e54c0a6248feab114433c0bd31ba1b1cbf1713b21d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://qianlong99.org/ckfinder/userfiles/files/55620538711.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160768b173ca4d---dozowuk.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/donffnlhndonllh350b2a9aefo/sudarogesunomuxor.pdf
    • https://careersourceokaloosawalton.com/files/public/jetifix.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210628082655.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca25c20d8a---dikisasevevubobakivabe.pdf
    • http://hanleyresources.com/images/70084617798.pdf
    • http://euredit-editions.com/userfiles/file/pupetulivulexonegowi.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/15287c4434ae427430bb238bc046934e/komipekejerigidezuj.pdf
    • http://haozuowenwang.com/imagefiles/file/90613691148.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c460a02---besusu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4545c48a60---nowosom.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8tp6e3lc0r365c3v9etji3efh1/28110444565.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14772aebf6---pufawi.pdf
    • https://thaihoanghung.com/upload/files/55676829398.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/41520901461.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfcb32c8a---22941030654.pdf
    • http://dlt-nkp.com/fileupload//file/39266089888.pdf
    • http://decaiyun.com/upload/file/2106192246105741327thhsu69evjl.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13987e77a4---vufuzosuluvaliduzideruguk.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zetikodusapemasotebadom.pdf
    • http://one9five.com/userfiles/files/27873912120.pdf
    • http://hbleg.com/admin/userfiles/files/12781545989.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n7g0mfldufli68pjrmn1sneile/84926299421.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf8bae712---4330455919.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=concept+of+anomie
    • 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_off00013379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 16792 bytes
font_01_sfnt_off00014b8b.bin
463523e9befda6c07baecba0743d6b4ebad1e78ca74b3f00b90d6e2aed9fd466
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 17660 bytes
font_02_sfnt_off0001794b.bin
262469eafeb3732ca842317f5b44d337c35f825ce71cf28a8a894371f87294c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1794B 10356 bytes