Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9d46b49f186c89…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfacee1ad09731aa88133da59186de4e SHA-1: 9c9a1178603329dd0ede7339625a8b1e6ae4109c SHA-256: 2f9d46b49f186c89e0ffab3f10f354f4293f097e8e59e27876a59917a087fb92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristics suggest an intent to facilitate malicious redirects, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://omegaplus.bg/uploads/pages/files/22801691975.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d8e7e7fe423fd9350d4fca342d7f88f4/femululezigopimu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f44760e80---63205898355.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7kqah5ctm298m85iiv337nn3j3/lidejobawevufemudiripaga.pdf
    • http://inspirationforexcellence.com/clients/66491/File/dazorij.pdf
    • http://a-swiss.com/upload/userfiles/file/ketejase.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/77a43ac445156e3868783e12cb20d261/60983512336.pdf
    • http://hysansam.com/fckeditor/userfiles/image/gewoxuwilebabevulaso.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/faee5f0706b577bbbfdebc03dafb8c31/mopudexeluk.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ebffc3b1e---zizidarejozujose.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05a3a970b---5176295671.pdf
    • http://air-con.ru/upload/files/10477883709.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tk4sa7c8p1mu7f0hp7q62rpmu/57837526311.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08a1ba524---63665634730.pdf
    • https://safrano.pl/userfiles/file/46234105690.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/69bb4bfede0512fd56f15331c809b760/lifufizexegik.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zofebaserunosow.pdf
    • https://rafautama.com/uploads/file/mipukemadeziwomim.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a8f9124c3---faxuboxifoligatezi.pdf
    • http://zetrade.cz/userfiles/file/bewewukekivajonoj.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f7562bf5---mazofanaze.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/98647049277.pdf
    • http://gld-lining.com/user_img/files/lonotemevexasabuxizafe.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1764c249---vojepuzo.pdf
    • http://acevina.com/webroot/img/files/68249623718.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=basics+of+biblical+hebrew+workbook+2nd+edition+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_off0000dcc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
font_01_sfnt_off0000f4d8.bin
0c81eb6321082995373c1fe99a5d229bafc9b260cd96a80ab063ce73ed9622cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 11208 bytes
font_02_sfnt_off00010ef4.bin
29377964ec810bd44573c91fcf7eb98d4e949dc219bf3eae50e19d8281b1fd66
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 17092 bytes