Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5e181f10b59ea4…

MALICIOUS

PDF

83.3 KB Created: 2021-07-17 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99dae0421570d010176eb2c620b474a5 SHA-1: c3948478d9eda83fd9c92b01fdf17863b81de35d SHA-256: 4f5e181f10b59ea4181d5413d3abff0a70d09591c2331746128c13ad2cf7c71e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://cambridgekapurthala.com/damana/userfiles/file/degipi.pdf
    • http://yds-wcv.jp/free_images/files/garinalikafojojasusu.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/norudimogo.pdf
    • http://learningkey.org/userfiles/52400547940.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/71967093987.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2db78ce84---jibibufikebo.pdf
    • http://dmhu.eu/uploads/uplib/file/lusafupix.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d4e2a74f---zivopamuxuzekoz.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a1491511---duxunituwufixuneluxojak.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tc7m0j6bgdbfqksve3vrs3ooi0/rokizuzavivapel.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160888f8fdf98e---5158208776.pdf
    • https://fablab808.com/nbloom/fckuploads/file/vofenifu.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/q7d3rn4dg0eohk68vas74hteqj/88423192062.pdf
    • https://hotellemaritime.com/hotel/upload/files/57110214262.pdf
    • https://actor-conseil.com/files/file/xidezuwofikonofubuv.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b65f7164d614f79116ddc96f2ec5300a/5342056515.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ae8a37d---rigewagivamojakep.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/zosubaginetusesuromolaz.pdf
    • http://annandale1963.com/clients/69704/File/25219792263.pdf
    • http://robbes.nl/media/files/54367018637.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096eeb99467d---87018518977.pdf
    • http://ihdbd.org/upload/files/48451617858.pdf
    • http://emeat.ru/var/files/10183844349.pdf
    • https://zerling.eu/nico/images/files/viwevetugagiwiponari.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=classification+of+antiepileptic+drugs+pdf
    • 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_off0000e422.bin
20bf8c4227f3f9d9eb25c27ddbe4ec6d011e194f4fecb83b44c1787d9fd2d044
pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 10928 bytes
font_01_sfnt_off0000fd58.bin
4d85b79df2eaac9fbd2d38588ab7aef3bfd6d902d4ee3768ff546feaec6a2f59
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 16304 bytes
font_02_sfnt_off00012795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes