Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abbadd2abd4dc88…

MALICIOUS

PDF

84.0 KB Created: 2021-07-09 21:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad73b1392177b9d396adaa0961175516 SHA-1: 13852e8b235e055a5a238b89a9f0b3d528a5cd58 SHA-256: 1abbadd2abd4dc88fd90760c91dfe3fb5823127bc583071d44bce2a0ca6084d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://odesignlab.ru/admin/ckfinder/userfiles/files/wipuloromisulajuxuwuj.pdf In PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/fujoluw.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/fowomuwegixubemewi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/629785553356e5a67a47af9e7951e4d8/67889484863.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9ljneemj3vlfhn65050n3e5k3v/42095156874.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/kexelunurizipufemikero.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/44819278692.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1f82cee23---bazegipa.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada6627f94b---93453385796.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4187fa87d2---damatomobiromokuzites.pdfIn PDF document text
    • http://landpas.pl/upload/file/82475847798.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b018986fe---65100428075.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608661a841063---gizunifovowanofa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1668978345f2413f4a782dfaa4162f48/49504121486.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/22010810968.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xanepogoxavewubiseli.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/021823366079.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/mikoxaxu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/venavofigomuvudu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607951d2b4179---viwuwozesovo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96f952dab---5621553826.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gezikoxogudewita.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060304290991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=are+play+titles+underlinedPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/546e4c1c12651c65d0792614a835ecd3/gurafowakiguxadiziwez.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 16872 bytes
SHA-256: 1857fe1ec391f5a38d970c65a226debd9e836dc5d5884c2949eb57431a55eb43
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 10460 bytes
SHA-256: aae61308e8230b606b51c5d911ac3d63acb2a87950cea6395a4fd2766e647f39
font_02_sfnt_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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