Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b8d082faf2dd35…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499e1292ca93fa81a8b012db413033be SHA-1: b9b0f476a32bde1a6c4931bf5d889aaec62df215 SHA-256: 74b8d082faf2dd35a0a095f6811135634f032fb749d7196bf4837da9ddb6aaef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3ecb9a3d3f0d5bed721a18e5c05eccff/vokenaraxujununubagit.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/lediwilimolotawuvowitiwi.pdf
    • http://ipoz.pl/userfiles/file/68555950437.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/cd42b7d086b60d7a73bce5c21a83e074/43916790009.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/16681415918.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/54188400205.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/j3lcc79lhjjoppbag6mpnkfo0b/64364005404.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ho16c371i4opek1732st27o7v7/57463194204.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908032249.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364e0546a17---30038085370.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/wadirifovesokovukima.pdf
    • https://activepymes.com/pub/file/vumozajud.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda3774c6f---bugolezewipibobefoz.pdf
    • http://swhos.com/upload/files/87081531881.pdf
    • https://fertilizerproductionprocess.com/d/files/89901260055.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/lokejanusitosevefuk.pdf
    • http://huucodatlanh.com/userfiles/file/92553348729.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1f4a8bf4c542fcd6565e66192fea9235/22562523745.pdf
    • http://applexin.com/ttpsea/files/file/zapanepivuwizola.pdf
    • http://consulcongress.it/uploads/assets/file/mafejadusujug.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/66982956554.pdf
    • http://madiagranitosilano.it/userfiles/files/85747520283.pdf
    • http://printrun.nl/userfiles/files/siwejaninizipome.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/60935417606.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wrong+turn+5+full+movie+watch+online
    • 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_off0000f1c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
font_01_sfnt_off000109da.bin
c9406f81c1b46616d9947eefc71e96d1799e4688ab085d05ec3f06ee49898797
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 18160 bytes
font_02_sfnt_off00013913.bin
e01ce480bae48e7ddee29d5fc3bfebf90fa0f17cec7deab422e9dc0ccc834e12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 10996 bytes