Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b139d786e3ffe…

MALICIOUS

PDF

71.4 KB Created: 2021-06-29 13:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab08d2b4fcf84d07a0fd5f75f425e9f6 SHA-1: 22547d590eac7cdf30c47468fb2a75accd6375e1 SHA-256: 7b8b139d786e3ffeff9d7f09a3fc0da8aff6d38689568132e8bb2213f6f11cc0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608af951db888---88620226242.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cv2ib8medntsrrs5mhbcs3s3di/reluramidapazivezim.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/81470039846.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/xojimisekimesoku.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/99563464688.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad426de920---milibamuto.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/supeferegowipuz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4o8tvef4sqiitbqd90nji6t0t9/kekegexagirajojidotebog.pdfIn PDF document text
    • http://bjallstar.com/upload/file/49404196828.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/mujur.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b55958e4---tavas.pdfIn PDF document text
    • http://matras-devison.com/upload/file/55893733288.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c7d6b631e007ff6e85b2661741b2ead4/6371275217.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c542b421a---32097796117.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf8ae6b9d---54049467405.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c05063c2729aaf1fc2fe3960a8438a4b/66621119357.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/43041058406.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/je1agobcbk71jk7hmr1pdrhou1/30329498539.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb26a23f6---pofiperukimizojogumo.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/rowopomanemejefuxowutojor.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/pipageronapotomevog.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/54024848726.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/63760657866.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0068b0be1---zizezeravogi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/740d62776fa46be7abde51194a2f414f/94873682369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+put+acid+in+a+batteryPDF 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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 10724 bytes
SHA-256: 501164042054ac953a2298ea93d7d2dd1d48fc00b0522377e702ecbebf758928
font_02_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 15068 bytes
SHA-256: c35ed89a31d431c83286993d7958f24bfb47ab51c6ddd166f0473798abb69ae2

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