Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad23a2e5632ac5f…

MALICIOUS

PDF

87.4 KB Created: 2021-07-23 02:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19672ba4f68bc56095bbf77acbb219bc SHA-1: 7bb6fe592db0e1be9a21b9913d45a2d9ffaf95b8 SHA-256: fad23a2e5632ac5f451de25dd736938fe08b622017ddac832c9d4a3045ec96ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e9d7edef458d20eb022a3460d96123b8/jarunuluxiwolemiditis.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a149716527ff8a5a2981928ec9d3ee01/tamononezijoxana.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7rdbgmfnjngblm56dlvnq4of3/95162046484.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/18969572884.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/98345302486.pdf
    • http://eksan-ltd.com/userfiles/file/25452047711.pdf
    • http://househouse.it/userfiles/files/notipewubuj.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/62447574914.pdf
    • https://atcotourismtravel.com/userfiles/file/magob.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/90818617951.pdf
    • https://abeess.com/userfiles/file/64559096313.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7kb9u2950v8sdq49n7iknjvrk0/45250235791.pdf
    • http://thevisionkharj.com/userfiles/files/soriz.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/disamomelexakakewo.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094556a2ef62---65859591352.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cefe1a43f---vudopotuwexexikilojujun.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a968e5e6971---koximorigebugokaz.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab43464604---tezewevirinoredag.pdf
    • http://sooclose.eu/upload/File/gibitukasawamebur.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad33edd8ecf7e9d108cfd50cf297841b/miwejujuramasajeboturokub.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608968a95fd4b---netofowufozipigezo.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7525118c94785c76e777e8ce15e625c8/66829948262.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=articles+exercises+with+answers+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_off0000efd3.bin
4338c9bfa35d9149cafea8253a43f2a38b84d3ea0bf7a84d24524556e6cc9bea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 17408 bytes
font_01_sfnt_off00011d3d.bin
d543e07fe35beb4e8bbace955453ef25071b7d8401121277924615a2a0c51529
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10768 bytes
font_02_sfnt_off0001360d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 16792 bytes