Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1c9e7ff733c1fb…

MALICIOUS

PDF

88.8 KB Created: 2021-07-20 08:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e194025ea622608684dc09b40a1809f SHA-1: 6c8cdbce57c15aa3d7cf21a20c2612e5176e2a32 SHA-256: bf1c9e7ff733c1fb74efb4132b4202640bbd85dbb48fd2fa409392c91cb35b17
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://banglatalkies.com/dynamic-images/cms/file/jadotodav.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6br67ho34i64ulo4rkdk5m5tkm/63721152816.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/79244867579.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bddcc2f35---47026744461.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fc20974c---vemisunaxeba.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/22794510362.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64572214408.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b599151c388---55603402055.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff084862a---fexovixipijoku.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa068b33f9e3eaf93eaa59706b03267b/sukuvejojavu.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/nubaledodofa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2e7b9cb5---tixapiko.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/89129430205.pdfIn PDF document text
    • https://noddy.nu/images/file/datenadigitapezexaxa.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c757cf1c2c---zopurozutuf.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/82479377332.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8d2f5fc---getiwobepatefipisuvir.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tr8faspmib0fl8e561451l7vrm/fisavamerizapavemujefed.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/nerajuriv.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-30/20210630115146613042.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf9847ebf---sinapagavojarafal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e959047f474---12225956502.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073617893882---fotorunafarikadopixoxazat.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/86617048000.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/1476765012.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c1f853e5---93782554317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mary+frances+wintersPDF 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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16980 bytes
SHA-256: 1ef41540e58ed8c4ef54bfc1a873072ecbfd1b173caa2c86c564227cdd9056e6
font_02_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 10356 bytes
SHA-256: 0ee256fd7bdc7d4e83c790714f72b3d0c8f417258e80d1a6ab8cc7645fc4d65d

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