Malicious PDF — malware analysis report

Static analysis result for SHA-256 6348041f7951e422…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 20:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dfedd6bc0e8d06ba8d7973cf5997661 SHA-1: 7e04bf7312d37e58cd168d2cf691b9b0de05a978 SHA-256: 6348041f7951e422da75e8ccf124f2caf478ddcd995f84cf0e82539c379fff45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd11a68c32---morazoxaxalotitonezejexa.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ac04a5b0b3e845b9de0550f2cd026c76/45637613456.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021618631476407.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e2da6811---rinagavexenabanewusa.pdf
    • http://beachfirebrands.com/userfiles/file/gigubuvawa.pdf
    • https://telewebmarketing.com/FCKeditor/file/gapikoropanulapif.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e98e8e387064d9f09c79ae6c45bb9de2/51421081920.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f6939ade45735d89f1c42b47473d319a/59708555903.pdf
    • https://designclarf.it/file/87256550474.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868165377dd---51656345661.pdf
    • https://travelsafeway.com/userfiles/file/nifafixafunegesupuramosiv.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fee42c638d5c984253ce8f19283eaaf/duwej.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0ac4027903b2669770a4f0ea771195c2/79664419922.pdf
    • http://fouladsazanco.com/Upload/file/betawofe.pdf
    • http://norilskgu.ru/userfiles/file/nasegowuzuga.pdf
    • http://apexnepaltravel.com/userfiles/file/33367481114.pdf
    • http://applecentervn.com/uploads/image/files/birodixivotuso.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3bno2v97mlitsb4pokqqaf6rfj/598080365.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc4133b4e93a26fadba51fcaacead63d/282152407.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/61c0eb403bb6374415f283f9d9a15aef/wisiwujuloxigitube.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/7814857280.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938d86c4fff---40344126890.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/k81jacrssnkqq7h1tvptam6iln/48050909541.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a901bdbbd9---76425861348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=comes+the+fiery+night+2000+haiku+by+man+and+machine
    • 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_off000105bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
font_01_sfnt_off00011dd2.bin
97900d9cc2b6307507cc4086e213b37d65bd53feda7d5effc34827c98fcbdbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 11596 bytes
font_02_sfnt_off00013919.bin
8bbf0d856134995ffc1b0464c1e2151f7b6cc3a6ee99fd29e62d020774bde7bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 21188 bytes