Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdad9c2c9450f23e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 16:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7a3e2ce64ef5357d4506095fcad0468 SHA-1: 78baff5283c9c9aff8a86df7cabcf11e1f0c747d SHA-256: cdad9c2c9450f23e8e0f4798910b393d1a45ecd6da037027ee181068c9e33ca1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and the nature of the links point towards a phishing or malware distribution scheme.

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/s92a04a4vu7tic15ljbuvi4j2e/34184844096.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acf39fb5f---50456343124.pdf
    • http://cesishotel.com/res/wysiwyg/file/15058302629.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe42340ed1---vitejemusa.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3968432574---81421470094.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d5c422de78f6ad2f9c367c573d58a064/dujekagidolixusezuredeto.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/9d40e25c3783a57a8ebda60bdde16c66/87552115608.pdf
    • https://amatnieks.com/pictures/image/xiraselo.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871fbf34d72---8271458306.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8dab72b4---90751623565.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ecf68bd74f9cafb09403cbf871491796/56761430787.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82bbe478cb---69498189425.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a8fd6eaf142da2428a7115cc5374c55b/42288722959.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aca4a5675---zuxibewena.pdf
    • http://washchienluoc.com/upload/file/fupomenijizosirajamatob.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607126724bae9---21211214492.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/43960df86f645850fe53d266092a33d2/zidasilutuxifuka.pdf
    • http://nedirajtebosnu.net/userfiles/file/zimabege.pdf
    • http://nuestratierrapremios.com/campannas/file/6169534035.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/96908747813.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c539cd74---nixobelefegufomimokixazak.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/15314479611.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb33b3a7ab1---35689466711.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e65612c6---81076021870.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=different+types+of+hyenas
    • 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_off0000f0a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
font_01_sfnt_off000108b5.bin
a5f290a56e8a769a09c390304640cc5f2fa1b44d0fe0145429af0756188f1b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 17720 bytes
font_02_sfnt_off00013662.bin
607dd826ae2d3f8752cd299e1f892f9c2cd2569a8b18bf617d6548d6e085b8ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 10524 bytes