Malicious PDF — malware analysis report

Static analysis result for SHA-256 5033a43533885057…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 23:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e1df19d0f033cbd85673d313969a7f4 SHA-1: 736bc2aeee975547a2ce74b19dba24f2509f5806 SHA-256: 5033a4353388505760be40cf3e2ab644b7459900be3d21c8276a170c031c0f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=graph+instantaneous+velocity
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160928d11c2890---1342615396.pdf
    • http://www.physedu.in/newsite/userfiles/files/gunubijezit.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac557bc888---sipefetulaxafeniziru.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/687ebb5824e68f1dad80c4d8cc094f36/18226309961.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160884d17b92a0---34948393203.pdf
    • http://clubesquilacoma.com/uploads/files/11534327373.pdf
    • http://vangphugia.com/userfiles/file/74747249469.pdf
    • https://riolospettacoli.it/filesUploads/file/tagokodilezufosevelo.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf20a33511---58209096622.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/katajevixutonokoteb.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc589f2f42---84811585240.pdf
    • http://fecirturizm.com/resimler/files/13994154213.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8de6cf9---dozovadodobexemusofaxiz.pdf
    • https://banderlogclub.ru/Files/file/xijufujubalagadawut.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088336747e77---kuvaginanajajufegeja.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2h24ibdqsm77l592c0shgsr7b8/lixalazapuferixu.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5b9713dce5ac9591ef6e8ae772537c51/toxaruvidosalexegil.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e8875bd4dbd659f33f468a11188d036c/denoneka.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a1cdca6b---geneduvunexotoveke.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/38820d03151d73e2660d1b68108254eb/27159027709.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad425a3689---11053942818.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd55.bin
78bb0aebea70d4e07fc678b30ba645130c24ebceba75790d087e14508dc43a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10792 bytes
font_01_sfnt_off0000f638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
font_02_sfnt_off00010e4a.bin
82c0d95be0ee2bdfd3aaf4e4c2e7f2fd6cfa3d8952c925bbb5b58a31e7252b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 17836 bytes