Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5cdedccd4ddf8f…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 14:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07c7e6333d4074c2de5a0f5702d169e8 SHA-1: e7cffbb4f9f106dc252ef36b25b7286e8d85938e SHA-256: ce5cdedccd4ddf8f6beb87b432789560decee99e5285bdd3535913413d197e42
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. It contains a link farm with numerous URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://travellightnepal.com/userfiles/file/lomosonabijar.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/gagarotopedusakuzesurigo.pdf
    • http://dermalab.pl/userfiles/file/zofejizofunakigapufot.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27900a608---92782109019.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8623b44dc1---mafuveledekiwi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ifm3m18fsibqa956io4vr6te03/gedokeximon.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4aade871fe---1666054441.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767919855b9---bomigofukonobikebowum.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbc16620f---64564488638.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/tuwofor.pdf
    • http://hpworld.hu/data/pic/Image/file/gerokovimudi.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/nafelodesenupikosunebamu.pdf
    • http://oicenglish.com/imagexx/files/82209540820.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/48819225344.pdf
    • http://campbellelectronics.com/uploads/keweromezolak.pdf
    • http://autodilykanka.cz/cmsimple/images/file/76029051254.pdf
    • http://asja-doll.ru/userfiles/file/juwovorege.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/21942607166.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b01508ed030---24340053936.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/95ca4285fb8d9162ff118e61bd1614d8/29197575299.pdf
    • http://garmagostaran.com/Upload/file/44129380252.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160814a4eb7a84---nigiliraroputenari.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e2e055fd---74905457526.pdf
    • http://auldskoolrocks.com/clients/878384/File/jalopaniwo.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/datexamuru.pdf
    • https://aedwea.com/upload/foto/fukibijafeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=subway+surfers+unlimited+coins+download
    • 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_off00010025.bin
36b53f9bc73e088eae1428e51e4c3d0b32f0d7b9231f84b182ca20bc698b72c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16828 bytes
font_01_sfnt_off00012c0d.bin
16c75c96cb093d726cad615b2c1278bd7b94a5811e12d99e154ac11fef1641c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 11152 bytes
font_02_sfnt_off00014626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 16792 bytes