Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd8871c18cb756…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 02:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bde413a4eae28e413adf761cb5a1f2ef SHA-1: 96f7da305542df8f96feb6ca7be854e821352fd1 SHA-256: 28bd8871c18cb7567eca954205b7278ca94890cb9f556186e7b4bd18c76b42ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous embedded URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://istanajpdua.com/contents//files/pilarigupo.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/walikakojari.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/505bb708c3e4a189f3596c5302b2e4e1/31887542948.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9fcf3e7e---52383506561.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/3105726610.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6aeb8d3c4---87218435901.pdf
    • http://ufnk.fr/app/webroot/files/file/27065792972.pdf
    • http://martom24.pl/martom/userfiles/file/dapatisunaregedotefef.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e053933b6---24857364887.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/rexuwowijuletujo.pdf
    • https://europartner2.pl/uploads/38150565367.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d53903063---sefosubukatofedusipug.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dakurojozijatujugoji.pdf
    • https://a2designbg.com/userfiles/file/toganebimavewi.pdf
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/52496802217.pdf
    • http://xpressup.com/userfiles/file/5409812377.pdf
    • http://eros-arena.de/eros/userfiles/file/75638080528.pdf
    • https://5udua.com/contents//files/23816395134.pdf
    • http://a-kamen.com/userfiles/file/87421019793.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/64650055567.pdf
    • http://se-ty.ru/uploads/userfiles/file/tesesekefukiduxirabejojuw.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608922b088e5c---gifirixud.pdf
    • http://abogarestudio.com/userfiles/file/20486410020.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cortadora+de+pasto+manual+karson
    • 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_off0000bee1.bin
758ecb0248991072c5f2009d3b0f1941b9bcb21afd7a7cc4913b94aaeec8462e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 18028 bytes
font_01_sfnt_off0000ec81.bin
119f7891405892d9b9d08ce20b2eb7f45abed428202f249067aec366160afbb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10684 bytes
font_02_sfnt_off00010507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes