Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ceb79a73d7b3a1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 01:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 478262142dd13043296e498d078d5f1c SHA-1: 3302d70af5b9b6f42408333e66fbbbb1257b2ff0 SHA-256: 12ceb79a73d7b3a1a1a8f7d7369e8bb610a4402f794f6c0a9671d6e297007381
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/jebodoneguxusozafugeror.pdf
    • https://kaptenhoki.info/contents//files/vekatibetuwimowekila.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5842696469---wexok.pdf
    • http://www.derbysignandgraphics.com/uploads/file/mebozanasigupav.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef5d014f686f7ec180a50c4994e77817/wiziwufas.pdf
    • http://www.rify.us/cms-uploads/files/66381226001.pdf
    • http://livingkaneohe.com/userimages/89615829347.pdf
    • http://xn--j1aii.su/userfiles/file/10321243788.pdf
    • http://daimarconstrucciones.com/images/admin/file/gikakozupowozazoned.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ced7a19e7---jupelisujofegexod.pdf
    • https://drrajanmahtani.com/userfiles/files/zovolagefazerupuso.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/obl0oq53rt5pjsbf0b6gcsad61/80748704577.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed77b8bfe---94529934254.pdf
    • http://nedirajtebosnu.net/userfiles/file/57185393655.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bb300230a996426e0517b27e5ee158c8/77214060786.pdf
    • https://asi-filter.pl/files/file/luruwulu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52e7791124b8a504d2a16fa2da513560/33627555763.pdf
    • https://gkia.org/kingkong/userfiles/files/9216487380.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/90671771437.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f18313e655fef0fd9ec95ae6609397ba/veruwatovasebeluxizegu.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/fotajaxugotifenebobarig.pdf
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/tularupuwixuna.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/taaiu280bok6c6c88m2nkg28kv/vesimovozebojuke.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/81fe506bf05fd9fe94d93ff7b701ff2a/dowinakasivelomu.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098228af36a8---xoxujekajigan.pdf
    • http://aftckwt.com/uploads/file/jasowula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mettler+toledo+fiveeasy+plus+manual
    • 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_off0000c2b1.bin
320703b4fc5c37cf9d27a853828af6c23d2a43798baf3971c1286075707a8c27
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B1 16980 bytes
font_01_sfnt_off0000ee6c.bin
cc34e8c0db0a8cb77fa52700384bc5d04c64461e84877d7ab4e1470fc44b0890
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10932 bytes
font_02_sfnt_off000107c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes