Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb72ce46d5667a32…

MALICIOUS

PDF

99.5 KB Created: 2021-07-18 09:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b31fb6bc022e4b46af53eee6bbe64fe3 SHA-1: b6351f69dafce96f3c8cd913cae2cfd3fdbf1182 SHA-256: bb72ce46d5667a32765f86b8fa6b6c2baa0b37f1effba6be14d501da8b086da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://steklo-shik.ru/userfiles/file/wesikowusularuxenonifuv.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/31574ae40b01f9bc095ee432e2e361da/kotikinupopazobikino.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/58659752f34a882476100b6532c7d02b/28140563497.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/004e0cc87aac8c382cacd0605e63115e/38176451634.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/24408446137.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kutoretezutese.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/ziganik.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/392f847210a442d1671b5b3bb76df1a2/98067454363.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff495193f6---1548538591.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4bc773ff89302e5f65e52099def0a6f6/20561406033.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0aj5qds07cohomd5i3uplhma62/mixosimejiserososiz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160789868e07d0---40905837077.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c47a419---13386606753.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6782f3050---44695545329.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ba2qoq009s33igso6ca7te2gd3/buzafi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072121616963---2458189598.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/42328450008.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mobowawojakoda.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/repimup.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4428191af---23815907217.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/lunijigo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e877b33f7418c6e29a961e49fd2030a/kupuzekox.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/lafadoxesazadulekisutoveb.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/74109461241.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/bivakopufatumidizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tv+guide+listings+beaumont+txPDF 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_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 10864 bytes
SHA-256: 23850fcb56e588dda888119dc7fd469dcbf1109e4ae7bfdc4ec6ac43eae90c8a
font_01_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 17712 bytes
SHA-256: fff409f8dbb5032f8b2c027c30fe6619a2c749722ba897d20b8dca1e206cc2ba
font_02_sfnt_off000168df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1