Malicious PDF — malware analysis report

Static analysis result for SHA-256 582fb0aefd3549ae…

MALICIOUS

PDF

70.0 KB Created: 2021-07-14 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8604bb682e497fa916d2575cfb7d60d8 SHA-1: 2685e53d6379d6a1e0c613b725241863f49e2157 SHA-256: 582fb0aefd3549ae0ebd7193af413b98574a7b189a432c2d1769e0b76564b649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious or phishing content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5d389774ba3e198608597d8279bd0b6b/nemifuwerawamo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6de3d2d60---sinutuxuxuginoveresi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8qtgqig5qskrb2pfr0aja2rd03/bewuvis.pdf
    • http://batterseataxi.com/survey/userfiles/files/nimuzomajoradefozonefo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ca1224ea17cddf917fb6f2095ca5cafc/sipusofumujumaxuvowigaji.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rorijulurexegogeduz.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2dec50f4daa74c7b9ab98ec76ba2a8d4/rutunedivowo.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tvm2rj35q2kb9vfc4iltfn7mg4/87344107897.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/89398061076.pdf
    • http://4bx.pl/public/file/15098654083.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03550c633d---tubokosize.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/35f9e811c3cae87a38ff6f9375549f5c/57473124137.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a7e166a013024a5a37d8b64902b9a5f1/23471983692.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c420ee6f8---mufupupekofu.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rukotofizabikozesoparuzod.pdf
    • http://atomleasing.ru/media/File/roxedidazatuwavuvoxaxede.pdf
    • http://www.pattyn360.com/upload/forum/files/68430325803.pdf
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/sedemavurijinokakaza.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/699db475e19deec2a77d7854c6c0edc8/tiwebeposiro.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7beb55f87dfcf0ada3617359794ed480/navanet.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b18c2d94---sapogiw.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8vohdibptdip6082uios76tp73/nuwodajagafusagitikite.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+narcissistic+abuse
    • 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_off0000b34c.bin
c39e87afc21dfa51a30b21dd573a7b7987629c4dcf027f32d1a4aa52cacb1a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB34C 15120 bytes
font_01_sfnt_off0000d996.bin
130174e5462f88510d9ea868d9664cb1113f6df09b94746840c52ae7fb14b15b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 10964 bytes
font_02_sfnt_off0000f2d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes