Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae05aedd56c26603…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 23:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53ed0bded1c967b469253eec5aeb1fc8 SHA-1: 50e3e8da84b0592739e736ed7faf438ab0c8d843 SHA-256: ae05aedd56c266030c83043e97f1b31e5083d2747409d78a6688af6ce40a3389
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nnt52.ru/userfiles/file/59434950421.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sq71l7ls0er695vh41iebco62g/17712183625.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088527342fb7---barexof.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5905699438---57959383513.pdf
    • http://washchienluoc.com/upload/file/85836331346.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59f54ca4fe---7663452000.pdf
    • https://pacpartner.net/images_client//imagesfile/gukidokevuzuj.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e2c9fc1d---28759222823.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c11dc337ebd---didar.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85852a561---80304709111.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86c5b4ac0---gametotobavevulobalijower.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0a214dae1b896367e7b14b32f2c4a851/392019681.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2289dfaff---31830461671.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078bea568505---27736655000.pdf
    • http://agnieszkapawlik.com/userfiles/file/42765501405.pdf
    • http://csptech.net/admin/userfiles/file/23895568512.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a671988bd52535b2c39f66f0610a5656/selafigotafosador.pdf
    • https://ludifrance.fr/userfiles/file/26958053392.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/zegejekudegibeludalotutak.pdf
    • http://soft-pro.hr/upload/datoteke/83591828323.pdf
    • https://marljivo.hr/userfiles/file/49901188139.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1001c619610e977392ee1631eb9b23ce/5376284480.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/31a5e59de878f56f4e31964b41bb29a9/lirifidu.pdf
    • http://asianmosaicnyc.com/userfiles/file/2215023156.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tailwinds+west+wittering
    • 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_off0000fd49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
font_01_sfnt_off00011560.bin
89fdea4295498759bf4bd9ecaea40b33b563f528c07e4846835addfed9228119
pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10352 bytes
font_02_sfnt_off00012caf.bin
c3ff72f479b6a235818c65436ebc3ce65a7184474ed92c25bbe903df6955beb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 17324 bytes