Malicious PDF — malware analysis report

Static analysis result for SHA-256 2916fb128af7c1a1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 11:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64375e917896c25f42cb54b6efc68a92 SHA-1: e5d77435e98eba6e5544f74b057b6992c4d725f5 SHA-256: 2916fb128af7c1a158095be7bbcdf6ea467b49c2bc58fe5e698e8c707b01f8ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The primary attack pattern involves luring users to click on these links, which could lead to phishing or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e857463705ab19ab6673a2e94a24bf38/9588930232.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zuxasitojoban.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sorawam.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6b084d2f---30796362594.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/4208669629.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/lolowoxogi.pdfIn PDF document text
    • http://marymo.ru/uploads/files/61290650456.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/gixumidifolojobeni.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/rugele.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/34073566777.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gazorekawovekod.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dnnntt37m8j97kbs22fe0tftr4/lalinejuziweji.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xazusenopaseguv.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/71c6a21fec67e8c67f2e9301ddfc3612/57891245308.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984155e8cd1---motiwosotunijogovoz.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nizizimofefewarolal.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/latawo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/oi8974dipqqughp91h1jea5hmr/65011777334.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ji76gm500og5q1frjsdis93c8d/migefepatodobexefeke.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f4607245---54557415653.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/8818175119.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bobabal.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/31364185605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=comparative+of+equality+exercises+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_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 11236 bytes
SHA-256: d857a6359e89dadbc77793e672e4d2268d2a76c873dccdd167825559601ac454
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 18596 bytes
SHA-256: ba86817120e549e2a76b68942ec93d4cd57b581519462be8b781d1515a087490
font_02_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1