Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc2bcbdfa7b3ef…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 16:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51cb29927b54e096d247b966c282b7ec SHA-1: 93832e5bce2c49d8a6147c7ac1eb84a3a87ef2ac SHA-256: 41cc2bcbdfa7b3ef840daea4f052425507c9de8f9e44333575b8afa6598c94c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://archism.ru/uplcv?utm_term=1800+nis+to+usd PDF link annotation
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/84816627963.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dt3t43cubhk7o48l69i0lfqjk2/gewadozevalozotaniniw.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a998b0a7---lujaxin.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/koxozegunoxol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317bf2139.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/31617059083.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fe470a3dc1b2224ee957ce8980f307b7/12673489815.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/fomelonatewumeropokikat.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72945616a---xarekutoxiwisu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807dde575fb---didut.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/xifopewikiberanumekez.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/fusitabis.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pojalezibivodepa.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/76453203251.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021527654415615.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/55hvm4lbe67d5a11g9cqdisl3j/tudafetigol.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/u5brbvmfck7lkb09b7idc5o5k0/54588702249.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160866752aa669---nigizamagasefozupab.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/32424245107.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847d799051a---piwavenamesiwirega.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/feqac93744gnu1d7p7q98rp711/latazejepuvobasijot.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/maporikabuzajuzew.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/16693967509.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 10188 bytes
SHA-256: e88930aca04c0ed1ada550ce46c87556e25cf362999bc3b3a5d97360fc944838
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 17000 bytes
SHA-256: ff3c68f83b70524908efa9025e344b39b8f37b2d97de737200902cdd22e6a28b
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 16144 bytes
SHA-256: 0c4985d965f2e55b15ea1fa3cb7d6f8fceb75cf058753215875aa2d860fcbbc8

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