Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9cfb1e4a9c7c2b…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 16:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9edfd79bf261ce17734231d154360447 SHA-1: fd0a4eaf0b12961e39d87b59e9e9459b75e2e9d7 SHA-256: 1f9cfb1e4a9c7c2b08d71a5991c2d5607586f11ed90f423a976278a37735b1ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://apc-algercentre.dz/ckfinder/userfiles/files/3125546500.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bbe14598---86994695918.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/meqct3mbkcdgmhsgbumk5jcs12/13966645685.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/1151431457.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/95889085032.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210803_3640C96840DAB7B4.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/tajafaso.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/70645544788.pdfIn PDF document text
    • http://nfc.soo.jp/file/59677473962.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/82948955688.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ef355d6c---tadujidizewafu.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/mezosuwoxilitifekoziju.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/11053364877.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dawaboz.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097068885225---20402502449.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/lefotigifepufune.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b985ce8ffd---zupemir.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/daxirokapukuseketoxip.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kiduduvabavoduxa.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wokol.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1627271008.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/89822951374.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/76533262405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+ask+for+document+approvalPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 17224 bytes
SHA-256: dc71024b66ed7a18a909a9fe923ed6b4cb57bbdf205b19834fc0b0da30acd3f1
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11024 bytes
SHA-256: 5de6fbfedf7c32974a5e0eac5343fe7ad7156bc0b18b4f55f7af60be25db86fa
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1