Malicious PDF — malware analysis report

Static analysis result for SHA-256 673ca5ea75b1cdb4…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 23:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d349c74bd8294a4de9736578309b5305 SHA-1: 5be687e71054589c1e30cfb8a07d40d20ee72e97 SHA-256: 673ca5ea75b1cdb49c262dbece8385fc9db256acb8919f01156ab8e6d2a4f282
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+cracked+apk
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f69c6967---45332907881.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ejb9tcn7unhtpqn4vd9cof9vlh/80861740716.pdf
    • https://communeouchamps.fr/userfiles/file/lefegesevinezojerazufake.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8f70ae13---98051613019.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/8017592201.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45e06ff7d---83361566524.pdf
    • http://agataklimowska.pl/userfiles/file/51731328045.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa64ecc57---wuzapasisalekogi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cca2647a0---bipemiperawa.pdf
    • http://matstravel.ru/userfiles/file/wawobaritirijumogak.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077724680012---29545815065.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ba041bd5---40551615214.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff1a98dc8---63996246186.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4b86f521---24184756040.pdf
    • http://torgoborud.org/images/file/88802069111.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/83bbc527345ee333d174297b0a761766/63868214175.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098459a0d0cc---pugowimikupe.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8f178ae9---wawumikumesod.pdf
    • https://agrilaui.com/userfiles/file/zeperizizaforid.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6e41e9f2c5bfac10ff50e8a22b32edc4/74026806788.pdf
    • http://splogservice.ru/content/file/39099626252.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608060a85425a---fivobiv.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da38161829ff85f03eab1072308fd00a/bulakasof.pdf
    • https://alatheir.com/atheirwsfiles/file/vilegegi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4ab7ca49---vupovalekatowotekitagux.pdf
    • 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_off0000ecdc.bin
5bbb79135ec12d877f9443733c0f225873943ba3965509856ff213b1cf246b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 19480 bytes
font_01_sfnt_off00011dde.bin
eccbc03c155636e1920f9f15e51199cd803c4dc5a09ef46fd5d909637deae8d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 10268 bytes
font_02_sfnt_off0001350f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1350F 16792 bytes

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