Malicious PDF — malware analysis report

Static analysis result for SHA-256 4049344d5ecf7964…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 00:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79dcef5a7a0ee6122e5c8ac66b0782fb SHA-1: 810ab1290589fbc338670b004e8af25a81c5d01f SHA-256: 4049344d5ecf796440289251680a6429ac6e9b10d99e0debafc200b3da49b386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=fanuc+m10ia+robot+manual PDF link annotation
    • http://bydnjl.com/userfiles/files/kewenige.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/dutuwuzoxesil.pdfIn PDF document text
    • http://freewest.at/wavozevosogutoxuwowoxex.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/57bf35b03862a0027d7980edd6ffcdf4/35287645307.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c330abd690---45564764310.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/6986165347.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/12325197344.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/9388374964.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/pixobo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca332e269b8---54156149456.pdfIn PDF document text
    • http://regcureguide.com/files/files/90749623325.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ragalifovesob.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/90780746140.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/31861139516.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eab9e08e6---tipavibolozenizupokutar.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4fb9998f210ee0121a9fe12a5d88eccd/vozazonulesefix.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/68166500608.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3cd11040aeed24edddefcd1190bb0680/209299675.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pizevifupisugovubadipuza.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/29993034580.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/23956159665.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1aavhd28hhebvevs791n96ur7j/wolutom.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/jekugiregorenirajubejir.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b70dd91ca---fodazupotaligapetu.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108112005283035.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/948687ca4b0d14031238619eeae7bb3e/zonusoxuloxefifozewabulu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 16724 bytes
SHA-256: 28c4ce2bbb266fddfa50465c0ec6d3bbd745a89863901ee44c05ba474d58673c
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10484 bytes
SHA-256: 698cbba500011a99fa8ac3f646bfe21ed39dbbc8b5ab5055233b4cc417b7d2ef

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