Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b96d1bd26f94d1…

MALICIOUS

PDF

99.6 KB Created: 2021-06-25 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2dc2486cb8a41322d17bb0ce3378e84 SHA-1: 083f709574cdcaf842d81ccd65b80aebb7fcdedf SHA-256: c5b96d1bd26f94d11deed3218116b16c40be409827c35623b4685a0fd2ffe036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI findings and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic indicate the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=cystitis+for+2+weeks
    • http://agcslohian.com/userfiles/file/25935674963.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/25791207806.pdf
    • http://akcjonariusz.com/UserFiles/file/fovamofebesom.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/samulikemusezatevagofegub.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8124f1b86f4070015c595d0f28bbe8fd/kinonuzumobexawi.pdf
    • https://global-brand.net/userfiles/files/bonivamabunitutujirovuv.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f139908d1---woradoxajepoliwukosegena.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857344eb07f---67585978126.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/20plr9qqbut1dlj2pi0tubei80/83067879353.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7dh5ojd83r5r74gpfc5e085a1j/37437878867.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/77453634128.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ffca16fd---mipudabenekaxozinerejexa.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b366b5a88c---99648500901.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a800e75d6fb---juzitujogawuxibuwowedewa.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876d1864c59---67873369845.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_off00012229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
font_01_sfnt_off00013a3b.bin
fb5ca5809885a8e0275f89b82b4b0e4c0d7668245bef1f37c7f1362291a7c57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 17788 bytes
font_02_sfnt_off000168d7.bin
adc33b9901f48335039821e54b4833b933e3fd37335039c019e04b5fb5028940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168D7 10340 bytes

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