Malicious PDF — malware analysis report

Static analysis result for SHA-256 198298a0b0a115a2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 17:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d379be4ed3c8cc4dce96fd2499acd281 SHA-1: fe977f32321045c8fd040cda44ca1c830b3efdce SHA-256: 198298a0b0a115a25e52e2876c76426ea781223459f40925fc8da1de807954cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=future+tense+using+will+and+shall+worksheets+pdf
    • http://linza-market.ru/upload/files/mekazivasekegejapofu.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/89966980889.pdf
    • http://due.pt/js/ckfinder/userfiles/files/laginosedunagotaw.pdf
    • http://sushiosushi.com/uploads/files/19351314665.pdf
    • http://lixupeng.com/uploads/files/jonebawolibemagapinakob.pdf
    • http://loaamtran.vn/files/usersfiles/files/27264569170.pdf
    • http://vinhthuanvietnam.com/upload/files/87503513832.pdf
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/zitikegojotepad.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gefamu.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/67166722543.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/bukunojobalonunisodilod.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161442c4b14c0c---93308019034.pdf
    • https://baatco.com/ckfinder/userfiles/files/jugozizevanozapoxane.pdf
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdf
    • https://tranthachcaodanang.com/uploads/image/files/2628747347.pdf
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/ripokamopijunuruj.pdf
    • https://osakaav.com/userfiles/files/20875550660.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ef066c452acf85928253f9a9ebcc0a9/31805866544.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414ac8c4a9a---69911614392.pdf
    • http://tw-sincere.com/upfiles/editor/files/7480548547.pdf
    • http://gamjagolla.com/uploads/files/fepivero.pdf
    • https://yellowmangocafe.com/userfiles/file/losadijojujureralite.pdf
    • http://kiuanai.com/userfiles/file/rerilefilenapiwidogoxose.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/jawinikoruxirinowaripilu.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/99326985024.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_off0000ea49.bin
c8de0fecfae9f07f58b746070ed5d417d1dcdcc552228f94bfcde8b9d4a928bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 11032 bytes
font_01_sfnt_off000103b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 16792 bytes
font_02_sfnt_off00011bca.bin
9c211bf5f44c051877f11c1ce565f8fc703651e157367ef98605a26c8b367958
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 18504 bytes