Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc383678356c713b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 14:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c2f49b53818959fa16a949d6f472c90 SHA-1: d10a4c59e405622f77d7e31c85114b4d7cfb0168 SHA-256: bc383678356c713b7105f92724a4ca82ddc1fd2b12224912a5584912ee4d7d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the phishing and malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=dear+allah+pdf PDF link annotation
    • http://akinmedikal.com/uploads/file/popexatuzozifapupu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/gibamoseroliravez.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/56131716824.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/50863083907.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd88a029f---manadexekuzoretufegar.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pikebifid.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kexodojejifaruv.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lamaxabop.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/13638231688.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91494791473.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b47255084973665251ec7fc76af4213c/bezonijumexa.pdfIn PDF document text
    • http://kaies.net/upfiles/210816075951407153vpzbzu.pdfIn PDF document text
    • http://panteres.com/files/files/benomupipogiwepep.pdfIn PDF document text
    • http://sentralperdana.com/file/rupowixitabepomaro.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/xovebajoxif.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/92530746035.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c30ebb911ae12d02b2a0d3c95ae090ad/70222165990.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af872ba2f0---21243742629.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/89143392903.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/vl8ah6rbhrbh2rn5j3vnpgq6om/79826830637.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f507d8ab4de---54728787866.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e3ffed7c369d4af05063e413b091b137/movojezaju.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/70246523338.pdfIn PDF document text
    • 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 18788 bytes
SHA-256: 4b5113fed3a3459b7d54df6ece39c82ccf5b6993f73476fe96ab41a34b514997
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10012 bytes
SHA-256: 67f2a65625e82ba0f895bd5e2bcfa604f655f3963bebfd38f152bbb2a34c08d9
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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