Malicious PDF — malware analysis report

Static analysis result for SHA-256 489d56b6efb6c5f4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 03:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87cf656a7d9fbb1ced46d2c0d7a91add SHA-1: 9ebc5f0b029b4aa6ee59db92e98c8da8f8e40605 SHA-256: 489d56b6efb6c5f4d1a42c21ef4318ef191d6367ba3095d18b778dd10e11dde3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dsr5upkt9flntvv7hu6iofpvb3/51589977720.pdf
    • http://karpatskiles.ru/store/file/fewuzup.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f429901b5---62908000889.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62183d0e49024001768d87086e37525c/69341320765.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/77d58cb4b92ab9d5669bea03768ba8bf/81410548653.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9600526c4---33352001177.pdf
    • http://attlas.center/userfiles/file/kojigadijafijovod.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/54222212898.pdf
    • https://jerseyshorepirates.com/userfiles/files/92120009430.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bd89ce6c8055dd0a08339a0ce0009870/joribofob.pdf
    • https://www.micd.edu.np/ckfinder/userfiles/files/rosiwesilaxaf.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870849aed1e---8865106933.pdf
    • http://hacoauto.vn/upload/files/44389023441.pdf
    • http://flagrant-desir.com/userfiles/file/zosimirikafikugakamamakeg.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5g0lgn0pokoebvqrtu9buoa3d7/wiwepuvibevogevude.pdf
    • http://cnex.cc/images/blog//file/77112539098.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d6d6b9ac2a0a1351460cfee88ea4df6c/tojekisijukaratexizimu.pdf
    • http://www.keizerco.nl/userFiles/file/bakanep.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cde8c820cfd0b1cda5d258d558bd731b/39323042958.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/id8t1ql1k02r1lj84b1tlihupv/vosipoba.pdf
    • http://kxnjl.com/userfiles/files/95224270361.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261b12bc21---medagoladi.pdf
    • http://aarogyamedico.com/userfiles/file/1641221060.pdf
    • http://immobilieninvestors.eu/userfiles/file/gejabi.pdf
    • http://stacjaregeneracja.pl/userfiles/file/7721130634.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa803326c8---lozawosusisadiwug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+handwriting+worksheets+for+first+grade
    • 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_off0000fc20.bin
7dfeece3b405949149d5264c13d76d4a42743f15d146d30b03748487c76623f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10740 bytes
font_01_sfnt_off00011497.bin
3af3f49c282d5c330b2109c6eed2c1a94c172551d6f65ce2551875d21a2da2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 16944 bytes
font_02_sfnt_off000140af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 16792 bytes