Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b2785b2137efcb…

MALICIOUS

PDF

82.8 KB Created: 2021-08-10 00:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0f772b8f53353083c2d0a6a7876673e SHA-1: 584f67ef2a9951b7797a6f12ed8f9fc8925d0774 SHA-256: 09b2785b2137efcb9fc1eb728058fb07d7d43184d6477d8a6cd0af73d9b9ff35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, limiting the analysis of specific malicious behaviors.

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 http://stellamaris.cz/userfiles/lubuzawemipolubon.pdf In PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80779066163.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hgl1kfd3ra5hlje8haaoejtvu1/gisogusilamejixizakugi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/64050910039.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607d060ab90b2---96597402611.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e291786146---pizeborulak.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963fb9814b6---50622176672.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b39dc9b5---zenobanebip.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/c7j94raljmb7s4p4a1r2idveme/50955268506.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf6a84dd0---bumekivo.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/sejitasur.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/25593346706.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c901f639b3b---jasogalidamusava.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f9fe1667---nonexekusolafolaritigewi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/f0um7gq4h2aqm07nril4fn5b8e/nuwepamubisigugimewem.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/673933255.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/f5n7qfjfc131m69n0f4hg9dadv/zezamosukij.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2c22275a---badojef.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/notaxepibeti.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/sotepotileputepafik.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/zulatiwakukonumuzumukagu.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/62349677247.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jm4ujujfl27u2j48a1ffkvihje/93557017556.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b0d3f24a---gesemoledexat.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2147f0c92---27770958136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=approachers+series+integrated+science+pdf+downloadPDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 17396 bytes
SHA-256: 291e2a378a7e897c49f55402752b649347506ba836ea53854818137123ec17a4
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 10964 bytes
SHA-256: 8a923a66e04344f99e828000acd284339651825e109a64b01228a0d019e3a17a
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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