Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22c0f7f278da0e0…

MALICIOUS

PDF

89.5 KB Created: 2021-08-17 06:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fbe029390d37bbc926f32bac13f43a8a SHA-1: 5aa11c303d17905175fb64cc4a53589f00990eaa SHA-256: a22c0f7f278da0e01705f0f765dda56b743a300f4474eed06fb6e8aa823fd771
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://meesens.be/KrMee/Tekstverwerker/66329530043.pdf In PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tekuvesugizaf.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4de9114ba7---39935552278.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/15274108753.pdfIn PDF document text
    • http://runo34.ru/attachments/file/51244547249.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/luxinesakuditivavovodufe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r5fa463n6uq94pkhpn957gtc5u/46487779673.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nemepovitototiva.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098376c33a05---vegegefotumezovobunulale.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/153gjh0r4gcogimtis4mb6nk51/43686912862.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/15251998841.pdfIn PDF document text
    • http://soupworld.de/upload/file/55651996323.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/girigekideta.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8306226bc---fifutosogonez.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/jowav.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/25079410927.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5ec8de58---41537503254.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zoxupefulaxa.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210710070321.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/17968583175.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/26402282234.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/97e1a57b2cbcdae6f15a2de33e5d454d/ruresobitazojudifanonawex.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b6797893---3813635126.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1e3b6d6b---18896605151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=commando+assault+hacked+cheatsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 10668 bytes
SHA-256: 2408dddcf725c565637362a853a8c598621feba14a2fcf7351fc6b48383c834a
font_03_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 19156 bytes
SHA-256: b4738662487fbfe126c2a00437e8db961fcd222e2fe41fa7a9f0ba2d1a3b2dae