Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd2988762236889…

MALICIOUS

PDF

94.6 KB Created: 2021-07-04 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10f9120de83d10673f281c8bc679f51b SHA-1: 9a03dbd98e9d07aa25541f68c17e02a8c4aa2988 SHA-256: 2fd29887622368899ee79f0fade36f30e8d76408f9172e40851f2056b9acd602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly show a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://phongkhamthienhoa.org/images/files/35244523591.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l68csta5ab6qjmk4dku9cmspjs/xiderasixiragowonaba.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a20aa6120---jituvobiteni.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dda3899dd---25239200831.pdf
    • https://computerzone.pk/file/63386358165.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/31a850cb8b3738ef12fd7d35d9de3798/bewubi.pdf
    • http://varanini.pl/userfiles/file/rofupopede.pdf
    • https://medtek.vn/storage/file/popebunufavena.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac2aef52---33203703325.pdf
    • http://kme-kme.cz/files/file/3898844585.pdf
    • http://romangruszecki.com/uploaded/file/73421580893.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc5e4371---97116648765.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q8ukgd6u9ed3akscrn3nakgt7b/boxuti.pdf
    • http://provia-events.de/pics/fotos/1/file/53742118330.pdf
    • http://abwingsde.com/uploads/files/44687133146.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32024c09df---vojanusixomoxodezupude.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5cd95ac2b---labiz.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a11f174c5---woxumoponoxasus.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a0e5259---91514104226.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/12602374618.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c473d24a7627cd875433b901e5b40a3d/jafudit.pdf
    • http://thrifty-uy.com/files/others/9385902575.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tnjl8qlvpkgvpns47tvahm1ntc/18833787862.pdf
    • http://cocoal.com/uploads/file/19635452089.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=about+gulliver%27s+travels
    • 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_off00011031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16792 bytes
font_01_sfnt_off00012848.bin
b192d756cbff1a77d1e993f393c9d06bb0a7ab8693ef42a463c15a834ce9c38a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 10500 bytes
font_02_sfnt_off00014069.bin
6a47e5e86d509d66f85828397bd1ee8e7b3e900d804f956ef989f7e9b2008212
pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 17460 bytes