Malicious PDF — malware analysis report

Static analysis result for SHA-256 90590f598b72e4be…

MALICIOUS

PDF

84.8 KB Created: 2021-07-21 12:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c632362836e60288ae920eb7864c0d2 SHA-1: c70dd4ad1f0adb5036f6c96d00829b5d1381bd34 SHA-256: 90590f598b72e4be17d8c84edf1031415b9564e81dea99558ec301771a143b1a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/65ad70048472e30d39fe7eb8125bb0da/25732636104.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cbbe2df58---kigugaxezivude.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b125163---64443527109.pdf
    • https://ms02bet.com/contents//files/71693424700.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/72oc1sluarli6ni2nsp77df6co/81297099396.pdf
    • http://beijinghuojia.cn/userfiles/file/janejoxanapegiromir.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eqd9lo7hb2b2cgnrtkmbl6a79h/lilevadudosimi.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0f0d0e1bf4f77ec2ae0b3e3ea80264bb/70339407458.pdf
    • https://rivnerun.club/images/files/1380016314.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a4cd0ef82287a9ddb88ea6073802d6e1/dufudiworisilawewafedeg.pdf
    • http://antonio-pelella.eu/userfiles/files/43892377191.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fe7e455c189e48cd4eff5089d61ab0ed/88611310615.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d497fe5c---8893974922.pdf
    • http://rjbmachinery.com/d/files/62882975220.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i84igeo9d3qshpbajq0htrrhe6/97926152583.pdf
    • http://codienlanhminhquang.com/upload/files/6594020555.pdf
    • http://onishi-kyosendo.jp/archive/91125849551.pdf
    • http://mp-journal.com/media/file/71666236138.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4e598dd0df48dc1823de5f10ed92eb5b/pikaze.pdf
    • http://www.netcorp.hu/data/editorfile/27373465946.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ceb51b8bb983214e710760177c1c9a99/durulupavodiki.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vomobenabesupalilujexeveg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=name+5+non+living+things
    • 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_off0000e881.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16792 bytes
font_01_sfnt_off00010093.bin
c0a5a33411875f135834c5186ee1dc4b3365a150c73ce315244843795be3f14e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 17444 bytes
font_02_sfnt_off00012e04.bin
6a57ee9787a0d29ede127ac6f0b565d7c35f66ec53c01e6e191b629b0a9b929e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 10632 bytes