Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed14e167d267582…

MALICIOUS

PDF

100.9 KB Created: 2021-08-04 08:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aec38c223f609be7441286590f7f55d SHA-1: 7f97ac1cd73d6a97e0d6a70e9d86db7f4a6b59e4 SHA-256: 4ed14e167d2675829c4c28ed2b3dfa919b8b3d71974e302c2fecbce84b1e45d9
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 embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary purpose appears to be redirecting users through a network of links, potentially for SEO abuse or to serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://peaceinsrilanka.lk/userfiles/file/nawobovoberawibo.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610304dced2de---mafuxiwarosa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/wabamoladerojibew.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6jpe0bi6v5215660jsulun8tng/66288417818.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/podisorezevijotasolur.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/19563372346.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/76299841335.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/xifalanilapago.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0r36uo4p7n2vihklni95bslpsj/musos.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5cfb3da58df9ec4487d021d704ae36ff/duwuvavosivulozasoba.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/xupesogagetor.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3932c2c7f8667354adb761e4ffcee828/juporepinupirefarubofe.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8489e17a8---kogupebekofokotafixad.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0f3558eb---76053746212.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff3b6177c---xokizudagowufu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bavarun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f960f862ffadf74a611497c8ff1017d1/2316648496.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/kafomolanaz.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/37887652067.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/marib.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0fd310f63fde9b34e6d0aa1ca03def7b/kupulupulozapibodemivalig.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/mifexabegijufafurul.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/disupifesumopiridug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lexus+rx+350+tokunbo+price+in+nigeriaPDF 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_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 18512 bytes
SHA-256: 015f02403291ace47bed3ccf9c9223061062ff46ae154997b046f0d79533d1ea
font_01_sfnt_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_02_sfnt_off0001524e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524E 11320 bytes
SHA-256: 798c10b25d68a098b5c884d0e39bbf72a201728ca34dbe5e6737b58577dc9344
font_03_sfnt_off00016cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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