Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7440d3b055d0429…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 10:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c420876dce3538002212b6bfde0a554c SHA-1: 7d6a8b37a9cbe672702725664d277a9b97a66db4 SHA-256: d7440d3b055d0429a532af6945b559808db02e710b5f50e65b8aea5dc7f9bf72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or conduct phishing attacks. The presence of multiple distinct hosts and the use of disposable hosting reinforce its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4741c561e1818d3e37d9efec81c81b27/gowizokomukiz.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc927990c2c---79194450041.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a230f75d5a---23459167570.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ki4v2n576fvfmmp5cv954th4sk/ranozejewijowifosamuwukox.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608522167599a---zabom.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b0c0a19c---vimebivutufajumete.pdf
    • http://alibabashipping.com/userfiles/file/foxewigezirugiget.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75ea18b8f---82720587575.pdf
    • http://wabasnb.com/files/fckeditor/file/70849024360ae8cbfc039c.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c292abd7ef6---luguviwilel.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c107b3b537e---30339756533.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c93ab905---23687667031.pdf
    • http://sport-way.ru/img/file/90252568468.pdf
    • http://drjoecarver.com/clients/49355/File/13159178255.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608169cf09b44---xerulokagera.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/lakiwoter.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6d2b87ac---golopemezupuke.pdf
    • http://pokeocncafe.com/uploads/files/pivuzaledanafi.pdf
    • http://dui-antidote.com/images/userfiles/file/delifopupemoviloladaza.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd09c6480---julobepeluru.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qlat45qsavf2vfjl294kfioqn2/tanizirufedesem.pdf
    • http://tecsun-moscow.ru/docs/file/50953321357.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ojecqvtk1t98i7lliqclri4od2/nanoxujefil.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d5fdd64cc899f997ba11f2070600611b/75333915762.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb906af1d---kulivi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=overseeding+tall+fescue+in+fall
    • 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_off0000f234.bin
afeec9735cf8a28269201e87c43572d070b9e63bd29babbbfe11e3d63aad184c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10720 bytes
font_01_sfnt_off00010ad2.bin
77271183bafc26ff6510556cf501d9b5217382257f1ddd902308c76d59d5b91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 17372 bytes
font_02_sfnt_off0001385e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 16792 bytes

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