Malicious PDF — malware analysis report

Static analysis result for SHA-256 da199c7ba5bccb15…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 09:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 583228b6507021a7111006d4f13558d2 SHA-1: bbfac378ad0183b881b143904fba5d356abd0392 SHA-256: da199c7ba5bccb1561141626e536d4c3a620eee82b48ff0925f7731ea41f8401
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many hosted on disposable domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35084ce1a---mikogujabadigazabufow.pdf
    • https://prawobrzeze.info/userfiles/file/40491848059.pdf
    • http://arniestribu.com/campannas/file/67491215313.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f60b7ba70---xilabugaxi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p4ari4vhrnlnu6apblh75aojh3/359072485.pdf
    • https://havilahbuilders.com/userfiles/file/6474008574.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/pogupomiki.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/affb7112a725eda8b477056a399c4f7f/tolanaw.pdf
    • http://hiace-yoshikawa.com/js/upload/files/bolevetewewexuz.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c041aa93---zidewuxekugumetamu.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/371a9837d9c17824db6773b7ebbb9a93/visarab.pdf
    • http://heichapuzi.com/uploadfile/file/zabimiminegor.pdf
    • http://kinogigant.com/sadm_files/sevawawugapadopoxa.pdf
    • https://stmarys-perthamboy.com/upload/File/15256167817.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/raum6e9krb7799gmqvdd6ol3nr/38732751282.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6837c0c0---72809757491.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/80607110631.pdf
    • http://cdmvt.cz/sites/default/files/78905707246.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b32bc5b209f354a4f1e29afd79a4bcbc/17218768671.pdf
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/97981353564.pdf
    • http://bukharageorgia.com/sites/default/files/file/42991343590.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f8ff1856---tofonimagawogizo.pdf
    • http://tortsurprise.ru/upload/redactor/files/23350138765.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ac57cfa763c9d8f6220f7c762b9f8a9f/liwakujutaxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=postgraduate+haematology+7th+edition+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_off0000d5c8.bin
310d89867c3dddd09fd7f6722f4344e252e9b8964da4b650e3f43be6a08d9d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 17624 bytes
font_01_sfnt_off000103a4.bin
f233e2a68e16d7b70070eeeef588fe28a2597fb8a695e1d2ccfe656d508be60c
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11208 bytes
font_02_sfnt_off00011da1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16792 bytes