Malicious PDF — malware analysis report

Static analysis result for SHA-256 2368db62a37b3bf4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 481529602b7d16a35bdf122e79d72bef SHA-1: c19fba9085f452c87356b1fa101cef6cac6d299e SHA-256: 2368db62a37b3bf4c12d1b045a9191071d3836658f85022b9c10a582c03fd8f6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL patterns suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://etcpremium.com/userfiles/files/sokeruzajojesuz.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///46356445766.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lovisopokiroko.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s2dkaubf450cvb6spqooo7b5a1/81978217773.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910111348.pdfIn PDF document text
    • http://fohow77.ru/upload/file/74663293069.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/vodirejubopumadivagib.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/30678321021.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/7895300919.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/tafuluvum.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/77957942986.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/tekujesaxif.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/75108899560.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9qnbu99vmon2oja3sq8vv0otr7/48324808680.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7ba7cf0260a1216e85a6630bc2b90603/luzatajime.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66922832420.pdfIn PDF document text
    • http://velisend.ru/photos/file/18806665417.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161453dc6cdcf0---60471745467.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/firuro.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109230720532819.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16144f810acb56---suwarukokexexa.pdfIn PDF document text
    • http://slsnn.ru/content/files/59502149435.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/10967621847.pdfIn PDF document text
    • https://tdfstore.it/file/satibi.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/sunomedozeninidix.pdfIn PDF document text
    • http://labsshop.com/d/files/fimugisomodimelobujo.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/6408270641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+online+english+movie+streaming+sitesPDF 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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 16216 bytes
SHA-256: a88b4d2a5907982b8c64146105e0b8b5a26b978a4efe8147ff8ccd1cf3794540
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10600 bytes
SHA-256: 06999ce7c909565d286695b8cf25e39c89752e2f09bb9d4351a14e9bab7918b2

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