Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa3f49e4a120879…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebbaa8ec028c5e1a9e2177a9ffeff1c8 SHA-1: 86843bb1e6663c3681d327f962b5ad938d1293ea SHA-256: 4fa3f49e4a1208792a912f5c7329c8ebd252eeeefeb0a0f9749c0c2bc161f8ad
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious content or phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e2e0ba0f323d04f118498c3105455284/73138322365.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3304fc381070f50c1cc68c238d4a1f6/80619627879.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2401606e---6934608881.pdf
    • http://iccjsc.com/images/uploads/files/18294913790.pdf
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/pijukilubomupezoxokagutos.pdf
    • https://soechi.net/userfiles/file/rigupixekubafamus.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ce9252ed4fcea9f5b1ccf022f7ddc5cf/84747114961.pdf
    • https://binarbaid.com/public_html/userfiles/file/korimamegenari.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6e3e42ae---dunevogu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/02b97780c910012936c34637b7cf1b4a/75651622488.pdf
    • https://xistenze.com/files/files/50274017761.pdf
    • https://branchennachweis.eu/userfiles/file/96767871252.pdf
    • https://sanipacific.com/attachment/file/19696450546.pdf
    • http://rasmesafar.net/basefile/basefiles/zugumigexaforel.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255283ad52---pawamuxanu.pdf
    • http://arniestribu.com/campannas/file/22145269216.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/94d671d9bef7208de1e79e2f0c091dea/babumogofiwebisimaxurutaz.pdf
    • https://tangente-mag.com/img/file/48319553475.pdf
    • http://gernano.eu/gfx/userfiles/files/kutok.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29fceaabe---luzer.pdf
    • https://waroproject.com/file/22071838959.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/76808073278.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+download+mp4+movie
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin
49a2b03c1dd77b77c05e598343ab50d3c88cb439a7c999f2530e55fd0e6bfffa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 10496 bytes
font_01_sfnt_off000101bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16792 bytes
font_02_sfnt_off000119cf.bin
f32957cafdb92ee25759eeab762641e0e2a8b14e7a71e2efabec94b389c99c79
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16992 bytes
font_03_sfnt_off00014615.bin
bfe43d5959b2317135891740ee9f6bbd83044a2dfc391827d4c50438b6b55e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 1660 bytes