Malicious PDF — malware analysis report

Static analysis result for SHA-256 458b86c973b248b9…

MALICIOUS

PDF

76.6 KB Created: 2021-06-29 03:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b91fe1321fe3b2eb6ad064086b4caa3 SHA-1: 2b1ea8e9b19f4af01f297055b03d911d6101e29d SHA-256: 458b86c973b248b99697f43b415a4d692acd9a9ddd4043726d0d3608c6d76c1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=show+me+love+by+alicia+keys+mp3+download
    • http://aylincinarli.com/fckfiles/file/guzegepoxuja.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0752711f14---21079456535.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0733c7aa8a---67323978421.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607511e1afcef---45766163311.pdf
    • http://msinziniering.com/userfiles/file/widoteburadetopawi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3c0efb0f---22063638596.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/44356393752.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b4f88ce3ff4d933c0c770011bc7930d2/fubilukumafe.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc873d03f1---56537136524.pdf
    • http://hersheyhigh1981.com/clients/37302/File/42761063283.pdf
    • http://ddaengshop.com/ckupload/files/52595810221.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dns09upo59de9f7ndn1shkr9fu/zutebajokinamuzikuda.pdf
    • http://wabasnb.com/files/fckeditor/file/70868100160d1dc3540410.pdf
    • https://yukkumpulgroup1.com/contents//files/46965156478.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609217abbbff6---juvugirogajuzukusasefa.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912757f1f69---65069367460.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8a19ad7ff7d0bc16783a35f93f7a841d/jubekazozanijosug.pdf
    • http://benthanhsgfarm.net/images/uploads/files/tewigedigapew.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708f16f02b3---95772452439.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609644e76d983---12133119631.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd82.bin
2261a35c68a2d9a19e4d1ea0bdd275b0bbca9662db2b755808759e126130cd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 11324 bytes
font_01_sfnt_off0000d7c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 16792 bytes
font_02_sfnt_off0000efda.bin
6c2ba8582b486fc939d7192ae8cd3306b44c3c381084e736011a079f14319b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 21296 bytes