Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb805a586ebc75…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 05:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13b296529d12b1c384bfaf4f152d87e2 SHA-1: 61e44d8ee1376fb77783d2967172f8f63629f0c2 SHA-256: 41fb805a586ebc75a7b0196c16a6eff6ecdeafe918919928f11a7f33f9ece2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/144d0b9f8b381858877be2107c646b23/61403237995.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a668df4c---79727641671.pdf
    • http://iuf.kr/pds_down/files/nuxaruxolap.pdf
    • http://chonburi33.com/userfiles/file/46784613373.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cfb572a03d4a0e0af6f866d80dbc1a8d/36134859991.pdf
    • https://ddshower.com/ckfinder/userfiles/files/35687837928.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a4622aee---jemox.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c408f8693a5---42284392341.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jgniqtd3ilhsbvnk5gbnl77r88/wivefibikusosipona.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/65047436159.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bacfede85---ragegusenenof.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4b100c140283c8c783f264389c3bf699/xuxisaxasozose.pdf
    • http://maroba-zirndorf.de/file/16344016697.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d10016e9---xekiz.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cddb1404d---37381208945.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fa70deaccdb57ca42809a1c01dc5905e/bobivozekubuzelajeluzop.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9089d8b970---48409586812.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8da2336870f45cff27cd80c8be18a219/fixifirukikamotuwepaja.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609618ece3be2---bufokugu.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/eap2q63g66ksm5hp5g4he8brl5/senafokujejawobesav.pdf
    • http://alanurturizm.com/rsm/files/zoramajelusolekoxurepub.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc666bc7ac5---nigomeradaleferefexarasej.pdf
    • http://beamstraffic.ae/amb/userfiles/file/lezifobomilafikumaxepidup.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8f70c6dc78eb8571ab58c71693a15b5c/zubadulozonejizowot.pdf
    • http://kpotplace.com/uploads/files/takawogagilovow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+remove+check+mark+in+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16792 bytes
font_01_sfnt_off00010301.bin
64fa68da541f0c6048b7f951303d06ddf43372e0be5084f25adc1140862b9aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 17524 bytes
font_02_sfnt_off000130e9.bin
164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 1728 bytes
font_03_sfnt_off00013923.bin
3df6876fa41b7999e36ea5b92b893cb6d00fe8c7d2fd7d7b5b76af2f874e69e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 10904 bytes

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