Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd878db6c24fc246…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 01:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 146923fae37a99208aee37d129b00944 SHA-1: 9a29bd7167cd3a6dc1249b40ebe2e00cd065da81 SHA-256: fd878db6c24fc24679da857d04e532221b8cfe092aaf8e87b06c24a6f200d02d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=gay+lussac+law+in+real+life
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5bb84353---bititoliluz.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6cce14ac81cf78ae79f38512c35804ba/64720876905.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vg7mj4lvub5npp2uf514km9rnl/84208669471.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/09509d8ec8b1c5a15ca0cd06615edbae/26908666171.pdf
    • https://procogs.com/FCKeditor/file/21214096837.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0bc4d284ff94353f4903baed1dd93f16/nerona.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ujdkb8ee7356vc9dbr1shadu1c/pojibuwoxupiziz.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/be416670e75eb02732a97a259c1f5e1a/20697742138.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609924be7dfdf---makasazufuxolixajovuvin.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2090474ac---powis.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/089dka2glhk4dlpgom6raedfb2/ralekimubobetamevexiru.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2634f447ac---34986626437.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abddccc34b8---zanufejuwexarerotelafi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61f761930---pivejaputinapimi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb754d9cdc---11499868738.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5heu3bnjcecqsk190a187etair/52931353551.pdf
    • http://shengnabei.com/uploadfile/file///2021061516505150.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ds256jdr27vkbv3j6tc9k9v0e2/pizenaxemasuwoserubiwuju.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bcf188a8d6da020be9808124e203cd47/lotirizubawexojavopivos.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/113af300cc461140b5707f7e70932c02/70199755630.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nepevajemawaweb.pdf
    • http://yaqeen-eg.com/userfiles/file/tijirazidexagejerunire.pdf
    • http://chemistry.bd.psu.edu/jircitano/gases.html
    • 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_off0000f290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
font_01_sfnt_off00010aa2.bin
084f9b62482348ad31967bf04d064464864aaba5ec7b94d970aecce02da250b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 17828 bytes
font_02_sfnt_off00013991.bin
3fc389a7b5ca5d11d46c6a6228ad057bd73b49606ac7e4e3ab11fb8049e4b05b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 10448 bytes