Malicious PDF — malware analysis report

Static analysis result for SHA-256 e128af00fcd21d56…

MALICIOUS

PDF

92.2 KB Created: 2021-09-03 08:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74556d331d9c65025e8d2491d9e7bd0e SHA-1: 6e8a9240ec404efa1fe39e28a6ab44684642df1a SHA-256: e128af00fcd21d56572f0311acfb7f00f145ec2de67874b5f2e235de318d967f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://thaisomboonautopart.com/userfiles/files/99780574270.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7bd2aa92869e5c51ee431e8265b634df/6264461764.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126284d6d5ad---titijumonotujamabufasuv.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/gikewopijugo.pdfIn PDF document text
    • http://deauville.ru/files/file/bobelowag.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rizowuvoluw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d92dda33e797f4ffce00fe424c1b282c/34841554081.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/29644148670.pdfIn PDF document text
    • https://songhong.info/userfiles/file/14572758542.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/57502eaccdb0377c5503167f779cef99/natix.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9tpivlfkcbf9qpvld8e3medrtq/menawikamirilaboderumip.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/9710559388.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0bf48d8f909f9a343d156e78de83a007/74844815841.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/10602948429.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ed96e809---2351401186.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a49337bf---xegafomifigatexe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfd88746a---75197736035.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/63972600587.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a68563236---25649340034.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xamafuponidibimodope.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210819_5D8A1BC704FAEEF6.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5d2ff7b22b31260f1e6db5bbecb4aa7/3694890275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=marketing+terms+and+definitions+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 18368 bytes
SHA-256: 42f4185c966e98b9ca02da6cb476e56e20e9dacd736b4b18449c1c7a44acb6e8
font_01_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A57 10880 bytes
SHA-256: 5206a99d9aa5c06f93093dea1ea0a542f34c6b7564a53dec6af8b82806c46fe9