Malicious PDF — malware analysis report

Static analysis result for SHA-256 318f172a29bfc231…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 21:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: daf2a23797a9562bfb3e123e22d18748 SHA-1: 9526f9227ddbd43fd9ecd67e6d75063b698fd318 SHA-256: 318f172a29bfc2312719b8b8f7be9ef5952fbc97d2e5fdbecfd51a251740c8b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, likely to download further malicious content. The presence of numerous links to PDF files suggests a campaign to distribute malware disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cka-shiba.com/ckfinder/userfiles/files/80352086081.pdf In PDF document text
    • http://tandartsindex.nl/images/uploads/gosegolopavivi.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/81998743716.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a717e7e7f51---93932606631.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bjgbr4tmnglttv7sqvph9do7ge/kipeliginidanepamenesawi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f1adc6259---99551229489.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/47757558077.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b28adca28bc83ce8be0de111ad18ebc5/wizeba.pdfIn PDF document text
    • http://skncn.com/u/files/62891379835.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kbjo7e8lo4ua7elbjnf0fegqfg/vexafedamexeridu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60775083c7---45186425196.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f4e1298d54e46fc07c2c141f3e8ee6c9/fobot.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/31017529746.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/84979856516.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/68121424128.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/98820455827.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0916ad9df88e7c1aaa35336f8d8bd6b9/47260821106.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vke769icb8rln2sv7ba0n58jn5/49745710831.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tesodus.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/46891813717.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/88cd73f8a37953fc6720b8cb43b3c038/nitikimesonux.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a06bcceb3d27829746613dfa9da0b733/depinurusagit.pdfIn PDF document text
    • http://df-foundry.net/d/files/sazasozutevamarisonenokez.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zikofomirakisif.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/89d806b9b3bfa086a2289e11190a983d/timeloduguta.pdfIn PDF document text
    • https://aokman-drive.com/d/files/tiwofetologetisibog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hollywood+tamil+movies+download+2020PDF 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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 10808 bytes
SHA-256: c72756e4bb869bf255f8694e461f60c05e4cfeb9542bb5683af78f9e6251d4ea
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 17740 bytes
SHA-256: 69856c8aac4766a0e4a08ab3aedd879e352f37ad7919dc83932144ad1610d697