Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0d6b875d90d542…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 03:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d77e5b813c6331d3fd95d287f9bb271d SHA-1: 0755931a2f796a715f8bbe2cad23f36c466750fd SHA-256: ca0d6b875d90d542c254fac8fc2a4dd457be3ea4e5177cb8534e21f7e3c44b36
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nemeckystrakac.sk/editor_uploads/files/lonaje.pdf In PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/33531802224.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093127bd3337---12692703673.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/57579040230.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/lakegikewewa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e67635d3154---42752218661.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/155437006.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/popajusabenenozupusupunab.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/58859564504.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8995f11098---surijira.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/turam.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/22417269329.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c24931ba1---jisemagogike.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/002883da9101de3c1ace829d8fa723f8/88136209491.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/7949595973.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ab42de82f---67801274125.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e284e8ce984---23421178326.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b70c19ef2---fezijas.pdfIn PDF document text
    • http://cartopack.com/Images/file/98322791463.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/purubas.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zolugibabobaxotijobezofil.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c76thtao5kj1b5ejp3b763sq0n/fidisiruresanogaw.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/moxivi.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/53924204554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=for+every+business+accountancy+isPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/barenizenixarepavupifeso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 18276 bytes
SHA-256: 3148c707029097f427f459cd9acc6b02866a8b3224dedad905f193fec40c280d
font_01_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 10576 bytes
SHA-256: a971541fc762abb08065ccfd39c71c8f06855d0d3838023ceecded16c74d3c08

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