Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2c713f1c180535…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f181abd4f5ed1fedca5682d577732189 SHA-1: 3f64de9cc73fc37582695c3d28ef2140bbda1eaa SHA-256: ba2c713f1c1805351159f0a2c13bd8de1f5d87758c04a8adee9f7c76e30383c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a tactic to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=attack+from+mars
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/jelafu.pdf
    • http://elisa5888.com/shopadmin/upload/files/49841464207.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/84587240828.pdf
    • http://godsownproperties.com/userfiles/file/vojuvezoxewezekimu.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/tuwevatalujupifipupanakux.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615380a8876a7---fuvokizomokapexiwegapos.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/65080152577.pdf
    • http://associazionemillesogni.it/userfiles/files/geguraxavup.pdf
    • http://franceplus.fr/userfiles/file/58831838168.pdf
    • http://pass38.com/images/contentimages/files/71683442924.pdf
    • https://autosaloncenter.com/uploads/file/50474833346.pdf
    • http://gocreate.termall.pl/upload/fck/file/27615053506.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nenutenijututelozav.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/35264767963.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614325b415af5---mimetejuxetikeg.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615896b9b002b---lawapojuda.pdf
    • http://bjjiffy.com/upload/nabiguweduzipoj.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5iu2h7ptgrbbhp9s04sk4bmfn2/88030687638.pdf
    • http://beerskiboot.com/img/upload/file/numome.pdf
    • http://edilcfcostruzioni.com/userfiles/files/5271332536.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/xuponazemudojuwijuled.pdf
    • https://latework.cz/soubory/jirurasikapot.pdf
    • http://izeninfo.net/admin/upload/files/70150228987.pdf
    • https://grancom.by/upload/docs/2507439090.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_off0000ae41.bin
d4e59e269fd56193b5d0de512b5dc3bbbaa1af7291c0a4ad8efdaeec9b650510
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE41 10196 bytes
font_01_sfnt_off0000c53e.bin
889e6fa850d342c6366db365808bd0aff0291e9a0c093ce5143cfcec8ee1b4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 14812 bytes
font_02_sfnt_off0000ea38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 16792 bytes