Malicious PDF — malware analysis report

Static analysis result for SHA-256 92caba08013fe81d…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a1ad776bc295dbc24f93748e6768dd9 SHA-1: d82d4cb95e2476de52eac0aba07c8678fd8d527b SHA-256: 92caba08013fe81db3ba8cd41eb9bc33a9225fcd89cd3612a4dfb6775e2ba857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=tips+for+bringing+home+a+new+cat
    • http://www.multigacos.com/admin/uploaded/fck/file/vofobetopawiweguga.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0cb5e5b4c---48667247374.pdf
    • http://pierrevillers.fr/mairie_files/file/bajomexinakofesedef.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c8c5971c---sawaferukadoremijolelob.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2f03644d---vurusoparomolab.pdf
    • http://bukharasuwanee.com/sites/default/files/file/xifine.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2a92d92---20766881014.pdf
    • http://busankid.com/webfiles/board/file///denalezeri.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a432cc40d5d---badalarurofapetu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b10c7a16a---5763982072.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893c241abb---towiwatidugutikoxi.pdf
    • https://alteanetworks.fr/img/file/11846277632.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c660118cb---wotiwukatanuziwat.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4f1cc225c5577ffd347b2000a946ec07/3969811128.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/80d95b7f311918ab7640cb611cdb8288/34828688178.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0952d6bece---79035262822.pdf
    • http://niezapominajkowo.eu/userfiles/file/kogozapurodufigozosodotob.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2fa6af1eaecd06383ae61b6cbeb145c9/19005931830.pdf
    • http://zhouzhuank.com/v15/Upload/file/202162396491951.pdf
    • https://tort-art.ru/userfiles/file/11227608028.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093f685da9f6---xonajejagewupolukoziregi.pdf
    • http://dharmapremipariwar.org/userfiles/file/jawazowajojewerimafipuze.pdf
    • http://caratow.nl/userfiles/file/gujen.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_off00010779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
font_01_sfnt_off00011f8b.bin
6ffab11e1f3eb0d11445722b869894872adc5f87dbf05918d80a9cb9a38f6088
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16608 bytes
font_02_sfnt_off00014a93.bin
a715d2da2da42ae0de8cd864a508619138051138db32c6cb79393faaf72f6ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A93 11068 bytes