Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95039b74a705db0…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 03:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7216808abb9003f01f91dac81d8b1fa SHA-1: 239ecd3f95239f8a372363f9075250b166c3e6fe SHA-256: a95039b74a705db0d75084628fc7ac8f03bfb9e4c0ecec38fd95d48cc1c059fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=paying+rent+with+sex+videos
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/2632919286.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1ef03919---posiba.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677426f523---38054617723.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/25d8ad15697519db479183958c2828df/82291103514.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/881e4fda89335f88b44a9f780cadfb68/vosodijetufowe.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723238d090f---52086966982.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tnl7i6ogjcuqj4ecu0f2ehf185/lipidilolajidavurajaru.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788397f8e0---torodezedegix.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/46c0e4c7a88c8a9aa9c68abcd020acc1/fexuvatijisogat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fdc40b5e---36195757628.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751670dca5d---54191241992.pdf
    • https://regiefranchet.fr/userfiles/files/7644605136.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/uuflm8u9cj3l74jp7934bqjpk1/23564156674.pdf
    • http://ondrejkocar.cz/img/file/34778736009.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c9pgi4a7cvioaskddds985iqd0/rarujetusaxudifexidano.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/f09inurpp7rr93p79id35tl6oj/vodixelina.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6f502005b5230d66dbe1f0f46aff7656/tenoxil.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3bce77765a981a55c238193a1d8f4eb4/tibazedam.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_off0000ee54.bin
3ad16cf6875151ff57c58d96617f3650774cf7ce8c9707ad92f190b3280fef20
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 17452 bytes
font_01_sfnt_off00011bc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16792 bytes
font_02_sfnt_off000133dc.bin
c0ae50b04092f4aa2a7198ed12704b04bec5d0f11df59c3900287bb2469a8ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 10852 bytes