Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd568ea9403d98e1…

MALICIOUS

PDF

94.2 KB Created: 2021-08-18 07:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18fd7d901805debebe30cb063e07a4e8 SHA-1: 24d0bb469910a26ac79d77c081c531da83bc7445 SHA-256: fd568ea9403d98e1f3d35ec4978f79f173ea594dab0b98ff2aca528a020cd966
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=what+is+action+speaks+louder+than+words PDF link annotation
    • http://sziazsauto.com/uploads/files/14426635538.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a84401ed700cec5514f8dc37f6fd490a/32101724141.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/45583105281.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/samavomed.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/32f50e6f7b58281f92dd325ffbdfc534/sadegezaselugojusisevefa.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/44057019474.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf97913a2---53145446396.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b54254c0e2f---xobiwarov.pdfIn PDF document text
    • http://aven.su/userfiles/file/sinokewejozofimezazipoj.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/18402287821.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/950ce50ba24168b09b3281ed5d416c3a/lizezimenu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160773807ea63b---99526381713.pdfIn PDF document text
    • https://x-software.cz/data/file/55024199535.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/23824902808.pdfIn PDF document text
    • http://rld-carbon.ru/file/fibadatetanodudinukoki.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/16c36fef32b27d2be6f32dc77646e186/foralo.pdfIn PDF document text
    • https://seikico.net/img-tym/files/zilutekodo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/29910613647.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/5497121021.pdfIn PDF document text
    • http://geose.ru/userfiles/file/37439844107.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/92494042246.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/90639604010.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d46bd020---vumupawiwusin.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_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 17400 bytes
SHA-256: faf0b34b206385765c09396589df2e1745a009761057e5178e3ba9cd70dbbfed
font_01_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 10880 bytes
SHA-256: c0906132c8be599519e0e16d1510094f2a1db5fdda06c206594bbbbe27172cae

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