Malicious PDF — malware analysis report

Static analysis result for SHA-256 657b0669bb3b6e04…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 09:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf242d33d1efbb736d8739c06ee9a853 SHA-1: 7c2c5a9b70c92b3fe283ce56b3dc4bef08b6fe03 SHA-256: 657b0669bb3b6e04ca0cc1ecc3f33ade6a637c7cd93ab5aab5f220309b095981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mim2010.ru/userfiles/file/besipasof.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/83495146333.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/85191666413.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dde446eaf---xemelave.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f4b7120a34b17002a4c1be930b73e1d2/digabukewo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609437b86efa8---pefosavifusuwatu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c46cbfce233---44487484015.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129bc7a1d724---dudomepokunumaj.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/14415163348.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86107659245.pdfIn PDF document text
    • http://chapelguild.com/images/usr/woliwovijivigad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612465d28b8c1---37504881073.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5655d089---xowiranaw.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/vofagositogutarolidix.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/49231115865.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d13a3a2---14128738782.pdfIn PDF document text
    • https://luminex.pl/upload/file/64377919083.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f974f9b1---3866191783.pdfIn PDF document text
    • http://xsteelstock.com/d/files/30301535956.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210710111102.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/pilurufafadimupusofudafu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kujatidusupafidifigex.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/munabalunonuferapu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b593735bdb57821efe565c721e801424/53486483796.pdfIn PDF document text
    • http://aven.su/userfiles/file/xuvagodepijefawifafilom.pdfIn PDF document text
    • http://ustunongel.com/image/files/fatawilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fourth+metacarpal+fracturePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10456 bytes
SHA-256: 5f25e6bcc9d651b62b01fdb0d539557b6a6bb56039cccd1dea6525b853e02551
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 17712 bytes
SHA-256: f421aa9a3e4ccfef3c85b008451c2dd8fc9c2ca40e629ddf5da855d07611c26b
font_02_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1