Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae26957c741caba…

MALICIOUS

PDF

102.7 KB Created: 2021-06-28 14:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 226efbc1617d064d65ff5adc70d6b68b SHA-1: f579956e8c0c332cb86861d8d79df583c9037e28 SHA-256: 8ae26957c741caba8afc0735360e885d1ccb7c00542ed689f24cf1e65d301f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=use+vernacular+in+a+sentence
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bf4946b2a488fcf451e8d7e639e120/kudakovodedodukamapomana.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609434e740a7e---lakipolegefirifodeporo.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5ubh8elp6plg9pij3oimsu8e96/videsusepusibuzu.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/80399145296.pdf
    • http://iccarrentals.com/files/file/25939018447.pdf
    • https://toocapen.com/files/vowawosogabufe.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0029b98b---retuxakemewawamirevuwe.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088645b7a9ea---85492173314.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/893e525c6d2f2e20fc0d7986c151cc7d/vulunezexubozuramoza.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6479cc456079cc1071fc75efccc08eec/mogigasilijoxawitobadix.pdf
    • https://muguet.fr/sites/default/files/file/nirogikeloloniravimoku.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071be8e8790a---majarasela.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1865a1b67---bofuwulezafebizite.pdf
    • http://edu-family72.ru/content/images/uploads/file/nuzufowajam.pdf
    • https://rosenstein.lu/userfiles/files/pivuxodujefe.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/punobev.pdf
    • http://radissonhoteltraining.com/userfiles/file/43447548671.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd08a8328---simepaveku.pdf
    • http://archissimo.eu/userfiles/files/35230188011.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8741d3adb0243c296eccdafc544638a/nufepatalimekobesopomip.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3500f39c---83237618298.pdf
    • http://mulroyenvironmental.ie/userfiles/file/winabonutij.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_off00013532.bin
492dd3f411c5e6e63241fbb1a86a51b590b2cd1629047cc14289c1fb14e50a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 10276 bytes
font_01_sfnt_off00014c75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 16792 bytes
font_02_sfnt_off00016487.bin
560c8d62e86f6b3396a705c2ba2238e7d4287810ee9f1757f93a052efca60e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 16000 bytes