Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16b14f71a443309…

MALICIOUS

PDF

83.8 KB Created: 2021-08-23 19:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ff21d84bff5a0bf93e42f4f3ce2ae56 SHA-1: 117e2a139976fee06dea97ed281badaf66111a84 SHA-256: c16b14f71a4433092a460441f94493697cc833773b3459e4344fb11233a68236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms on potentially compromised CMS uploads suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://wastran.ru/uplcv?utm_term=simple+interview+questions+and+answers+pdf PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b946782542a---xoninujidaj.pdfIn PDF document text
    • https://duvanco.be/docs/files/44603486588.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7742c05df621d912f00fba479f0ac9b8/91508283903.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2e4bed665f166a07b236d2c280682b33/silep.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/pujibejugigajetu.pdfIn PDF document text
    • http://proart.by/media/file/pamudosasedadi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f55d3d593ca---2735368291.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ftftle19f7pgcnai5e9c5m3nhc/49400451086.pdfIn PDF document text
    • http://djpress.pl/Image/files/jakenom.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/kefegano.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f03fbbb1c9---pidasadefedukuza.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/gokifarodepepimubibejavo.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/litariwazegapakomimuk.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/88990990519.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975b89cec3f---kolomonuxowuzarinefax.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/tejamajalemulojadage.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/detoloxukapepulab.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7d581079f631b3a1c51e36cee948fc9c/51490535494.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edb5b1b7838dce6592fe3fa417309473/fuvenipizokeretev.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/bumoladanezojubifof.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0de1dacd---wisamaga.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210530120522.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1957c9d366830871e667083315e677b5/jokuwitosunagem.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/lupaveti.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16748 bytes
SHA-256: 808c37293fa66861abff19efc2d62eb69ec7ece7a0c6542814412d6550f04d47
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 11132 bytes
SHA-256: 4d222edf64aa8ba7bc4a9be663e5efbbf4c4d6d0b3a61d8a2fd959ed740bd964
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1