Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25773b33a5d3789…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78bc7e3169148142c96e4e7473dcd3d5 SHA-1: 6dbcd6328ffea98a83795b6bbb70846dbede15d8 SHA-256: f25773b33a5d378946cc8cd4e3792cbbcca7f03549cd010788ba45cf5cc5bf2f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple compromised WordPress sites. These sites host other PDF files, suggesting a chain of redirection intended to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa702c6f6a---87248444762.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86642ac31---zurejexorij.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077494311e78---pofogaki.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r064788kgepr08bqlhg724sqj2/fokabamewubadomurituribe.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/101517c9d75e2f4730028edb1e971c0b/suvupoxanasorel.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adac8b395e9---pinol.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c03d46ca2f1a75dd37c94b48e8a4cbe8/30613049542.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d8f02e7757f882af6531d99d221952c3/23090024487.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bb0867b3---debogevese.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2f6808c446473b5b5eda883e0ba1e934/rerakafitizosatidaweg.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c214cc0fd62---sojevexedaxib.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/eb7fb8b31e7fedca4daa558b48872694/2727582857.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c669de5a45d---8077194848.pdf
    • http://crosswaysrecruitment.com/userfiles/file/bunuzakatanunigiduluxurob.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qdm3rsbf0gbmu6l4egk4vb0b44/11927712807.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/42d1c127f783b74f7e3102b871c4346d/rokojimedetimosese.pdf
    • http://leton.pl/userfiles/file/33417031894.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/07b1804029d9768c34aebb32de563d52/ninifijufaxosake.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160856c1b7814b---vamesinujusofulubeza.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd0733158ccb8d7716b2e8b70d699e2c/ribadenijer.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a01db8dbb188fe44fc556316c485d50c/12927195996.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/k4o3spfrjuggat4v67vds0bm94/64023632586.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/31ca8f304dcea3645fb40c383be2e0cd/45034564194.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/mesezanonuw.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/881fc7cfbd540ace9f655548cba1ef72/puraliluxazudexixuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kutty+movie+hd+video+songs+download
    • 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_off0000ec4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
font_01_sfnt_off00010463.bin
4bbff8d06ece4dff9091606c40ae47426c90cc2dda1d12b4901ae46417bfa034
pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 10952 bytes
font_02_sfnt_off00011d74.bin
ccab3ac45ecbb7aabf28bc2ed27d259f151bfa7a81ea4dc3955bc2ef9dd4fa7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 17116 bytes