Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f96aa7904018b9…

MALICIOUS

PDF

85.4 KB Created: 2021-10-07 14:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01955c326dc244136416fa402f65139d SHA-1: 435db489021bf8c834d843e32a5dce93307fc291 SHA-256: 53f96aa7904018b984d12964219a8baf36cd4b2b08d6bdf2910286264bf9f4ba
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further payloads.

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://luxurybaths.marblobaths.ph/app/webroot/img/files/32047896638.pdf In PDF document text
    • http://myflora888.com/ck_files/files/98947758903.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/5905077020.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/63542813524.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81853088080.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/xixazirojibanube.pdfIn PDF document text
    • http://hotechike.com/files/files/bodidujobogoza.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1615df4405d309---pepodorepowarusutalub.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/renagerape.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/70601640755.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f266c8c1e---vebowatojazumefubupijar.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/72167861663.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dd6a2799---45573898911.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/45993767120.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5e2d7c0ceb0945539af1209aa26eedb1/pitotepefus.pdfIn PDF document text
    • http://japhina.com/upload/file/47444784753.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/5520367695.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/kebajazamewewepoteg.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/ditevebesoketa.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210905001316.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/begeg.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lerezi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f8582637---98514618367.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/50809214170.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a9fc165315c4c86560fe03acf50e2442/54416193567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wept+meaning+in+marathiPDF 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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 19988 bytes
SHA-256: 83a00ce7670852083a4be078e6dd5c70aec4ad98057af5ad63df3706ef1011bd
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 10356 bytes
SHA-256: bad48194e9426ecb90b732e1a8c96c9beed08979ba5fef5c45c8d4c68606dd6b

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