Malicious PDF — malware analysis report

Static analysis result for SHA-256 328530098e368ec7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 21:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 586f6ccd6b98f81104c873efe3d00168 SHA-1: 4d5fb9b9c4c7e166bb8e6408e545e5648e03ceb3 SHA-256: 328530098e368ec7dae1f81123974f5c73591f52c670c2a34853714569d548c0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URI and link farm heuristics strongly suggests an intent to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://noventa.cz/media/files/file/rorinexenatafugu.pdf
    • https://genegurumiraclehealer.com/userfiles/file/fowibodegu.pdf
    • http://www.sport-konyv.hu/userfiles/file/sopixafizasememix.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/dekumurunufawamuka.pdf
    • http://way-of-spirit.ru/upload/file/besazezawate.pdf
    • http://wgadget.com/file_media/file_image/file/14357989844.pdf
    • https://foodphotoshop.com/userfiles/files/62614641941.pdf
    • https://sukaunited4d.vip/contents/files/vukuse.pdf
    • https://conviviodihera.it/dati/upload/file/vosogasesuwosomo.pdf
    • http://luxlustry.ru/img/upload/xejigipufisizegaw.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/25251758949.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/62857245893.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/tegosuwofoziv.pdf
    • https://skatrip.com/basefile/skatripcom/files/jilokufaranufu.pdf
    • http://goodtraefarm.com/ckupload/files/77122736237.pdf
    • http://mycoapaisyl.com/webimages/files/koxisen.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/sokaluturoj.pdf
    • http://bradzo-ep.com/uploads/files/tokibisopidex.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff1ad7c85---28370622996.pdf
    • https://endobible.com/userfiles/file/55679878542.pdf
    • http://icoenergia.com/userfiles/files/7003753450.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315e18bf90d---vepigujesoni.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6522adf7a60f3faa26de803d733af3ba/gugadoted.pdf
    • http://csc0532.com/userfiles/file/20210908060929_kxunkm.pdf
    • http://worldwidestationeryholdings.com/files/file/58810434576.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gacha+life+old+version+apk
    • 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_off0000da44.bin
7e7b8490ac5554bf5e50967c16e801c93087221d5e2c90299830382ced3ba2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 10816 bytes
font_01_sfnt_off0000f32e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 16792 bytes
font_02_sfnt_off00010b40.bin
65aa5d704c5b15a3add4e12f4cfd0007cde55251b8a7204ea24424bf53115b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 19080 bytes