Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d940dbf963ce91e…

MALICIOUS

PDF

114.0 KB Created: 2021-06-27 11:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36ce371e995436069fbe46e25a013b95 SHA-1: 55207cb4ebd44fbeae8fdee15c42838c28008765 SHA-256: 3d940dbf963ce91e26dd6f7628955656bc2574b4a200bd3ad6fb9d7d65347352
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/07b48233226ac533c2b80e9199a03e28/zusojedirujobogarefum.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6f601955---befitoxulakusoz.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e2a72794---jaxotaxexakituvilip.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b48cd5b1e07---jelinugovifekijug.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4mankigre7fqk358np44n50ma0/gebel.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/75rtbgveca4nps8l1lrm40trq1/pebaxedozuvipis.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19bf0f462---besavaxeka.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5dee0bab---54069502200.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890a6d4b946---gokixelidodi.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a84eb83c4---46014688241.pdf
    • https://vinamex.info/uploads/news_file/17036776353.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nd5m2ip8a8c7cs43po13avgdo5/pezunisebugetajebe.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/she9dsgvpo66i5gpd0denf2kps/67543321550.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1ea6af35f57e87afc39e259f5dfe6fa2/gezuwanujegikafeb.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a3a60ff7---sexuloloketoluxedidixif.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210509041252.pdf
    • http://digifast.cz/userfiles/93850144447.pdf
    • http://sfera-vlad.ru/img/file/3818992450.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1c80951950cd357a58cef8325ed1f077/meridakajepereka.pdf
    • https://cabsfromheathrow.com/userfiles/file/berunevorejumewikexa.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/napfm5mo9g4mvcvos2s7coav0o/fakid.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3407ac527738bf3aeaa5ed2e3d1b44c1/pizotugerepugipotokewozut.pdf
    • http://nissanotogovap.net/uploads/images/files/xupipu.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/20902261167.pdf
    • http://dambi.pl/userfiles/file/bazizasonaxoposotaxu.pdf
    • http://viprealestatebrokers.com/userfiles/files/74593626581.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953ae25ce67---12872677423.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=top+10+action+romance+anime+with+op+mc
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001458a.bin
c6eabc0e786f34e9bd46a20732e32404c3a2056509a6b0610068810470d9e2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16244 bytes
font_01_sfnt_off00015b8f.bin
6f6fb76708b94d79c5bfd11c15cdb605bf4010cbd3a0cf891febdadd4668d431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8F 10648 bytes
font_02_sfnt_off000173d5.bin
f12808ebbcb2b181faf5b2e6fb4337416d27a747587ad3c6afd93ab6de3c5489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173D5 17596 bytes
font_03_sfnt_off0001a1cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1CD 16792 bytes

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