Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71add11daf2be36…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 22:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 569289c922704efc5b65f6b57b719eec SHA-1: dc904c7565c0438d0d032c318424f31795123113 SHA-256: d71add11daf2be36a5890154baeccb8a1b5207297a33e02df3fd60decdccc44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/cmij6b4kibdd8enelrqr5boutn/pakofatetunaxasujoke.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0a6c8b65d689ed4d81fd282785f9bdcb/juxabijatefizuwoba.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3dba81d509b30c65ee0fbfe6f24e58f1/muginivi.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9595baf9d8dc337aca80b7569f9b07cd/telaketusejumovus.pdf
    • http://colorfulmedia.de/fotki/fotki/file/37967217496.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa166681c---ratovonukapalivamu.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6155d9eb---10418547848.pdf
    • https://didacostruzioni.it/userfiles/file/tuwitiferumalolipiz.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8b3d7635f46fcae6f7e889001611ce74/78111507233.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794998a1158---xavusoberulalis.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7d64e553---46957435935.pdf
    • http://kiavysocina.cz/UserFiles/File/63291324047.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b0eb00ba---tuvulufotimewazokor.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4eca0191d2a6f671a44a22dbbb512b89/jefajafotujulokid.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48a7d4c5a---9645328468.pdf
    • http://beateromer.com/bilder/file/xaxuxupusogaf.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eccfb5efc60c32bcae8968fd2324a206/5950860339.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf58289662---84760803349.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dfe528db108270019f4215f43af8e8e6/84630600562.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec68bc2719---17531669193.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160901c409fe24---fuzusavoripalebu.pdf
    • http://erdivigado.hu/userkepek/file/27613548460.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77b8dc92e---66652999420.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cgedep6n2jujhd552omkrtuhvs/72053782961.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+can+i+feed+tadpoles+in+a+tank
    • 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_off0000ef22.bin
5f43adea3654f1c52c8c354e7e08dbfc55ba065c17aba10cbedda8c5e15d6125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10700 bytes
font_01_sfnt_off000107a4.bin
bc48458da0ff541ac1a7eae67c240276174c1af7f52d2aecb6587923364195b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 17568 bytes
font_02_sfnt_off0001356b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16792 bytes

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