Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde3637db949d459…

MALICIOUS

PDF

84.0 KB Created: 2021-07-16 02:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0bf20bfc82af8d9a0f763f76e216d9d SHA-1: 71cdf9b967f90825dcbc2ccf31aa455c11db023d SHA-256: fde3637db949d4594328066e9d2b30905f1ebe1581ee7a2d0afff847a354d110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points to an attempt to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dk716sptd6rslpu6argsbfo9r2/51694320452.pdf
    • http://uptownchantilly.com/uploads/files/34638112368.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/jqtsjjbtihm7pbgu5ism3clkjp/99755631754.pdf
    • https://rajaunited.com/contents//files/rimaj.pdf
    • https://aduanaldelvalle.com/userfiles/file/sibolafase.pdf
    • https://ajitcoatings.com/uploads/54208825160.pdf
    • http://goldartline.ua/userfiles/file/dipukerinorurelavabo.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/34142115739.pdf
    • http://wonsakai.com/uploads/files/bokonuwifajivobi.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/26480889339.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d7a507aa---59098683164.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rosojuspbolenr53046lh0dquo/97383455973.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb9986876---82799885275.pdf
    • http://all-pass.com/folder/editor/file/raguje.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b339c369---73516380267.pdf
    • http://bora.su/ckfinder/userfiles/files/20869487706.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d2f73543a17a80d8f2d2b5549d153b28/woligawoloxuxubusurejetad.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926c674b7a1---63035769830.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821d4216f31---10289763177.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087691634a23---kefekilegetetazuzako.pdf
    • http://arslanemlak.come/file/43370579842.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6e3b71b97c984a2d5f6ed3d3b2ab6d6/10238478297.pdf
    • https://childconcern.in/trila/userfiles/file/naguduxesax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=frozen+pea+soup+with+bacon
    • 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_off0000e791.bin
e70eae2812cab173753bc1860344d7c2ad4419771a435bae3e646baa39da9903
pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10788 bytes
font_01_sfnt_off0001003f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16792 bytes
font_02_sfnt_off00011851.bin
86916b44cabc5eb2d9a7055db71406d7f25e31093e058e62ad6790ed260bfbcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 16604 bytes