Malicious PDF — malware analysis report

Static analysis result for SHA-256 efefeb52c6a4ea50…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 21:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fa43f99de7024153b737726be47ae4b SHA-1: 3ea65918b1ee26e39a89842baaa03fe98d1a4083 SHA-256: efefeb52c6a4ea509c11ac23505cd62801b9bb5b40cc52eb2cb5f596713466ce
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting an attempt to host phishing content. The ML classifier and ClamAV detection further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dimensionshoppe.com/alpha/ckfinder/userfiles/files/37760215342.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/50685266940.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/36695090684.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/85519524336.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rofom.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/bizurusupegidetofuko.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/8131684960.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/zuxogikafuxanadig.pdfIn PDF document text
    • http://mutitar.com/user_img/files/jagedinalewixojukoju.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lalorizeranuwake.pdfIn PDF document text
    • http://happy-land.hu/editor_up/disidogolu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138d787cb9db---rilenewojiwanogatijiratop.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b8c75c3b15d74f11b3483b33b3a91ffe/mirekenilefakidojipuz.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/48643024357.pdfIn PDF document text
    • http://full814.com/upload/files/29859242759.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/649d565b6dd921567b173cb4f52da8e6/jutelofi.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/bekibitajud.pdfIn PDF document text
    • https://tarsiman.ee/files/file/99322403998.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/sidovezozum.pdfIn PDF document text
    • https://onlinendttraining.net/files/fonukewilazetomosax.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/56699070933.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/87636414119.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/rofozinesunu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3fe2d4c042fecbf6cf0081e590028299/15817465161.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/56619218009.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/8630981784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+know+if+your+iphone+has+been+compromisedPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 13788 bytes
SHA-256: 08f38f4ab2ed903b1c0855f7683a8953050b09d23776a046f1a97a8288c19cc9
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 11364 bytes
SHA-256: bee43f3a955dd5ee5dfedf3fdbdc487b6622db821ccebccae25fb052312c2869
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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