Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebabb286f7946c9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-15 03:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f49833f34d1d62329d6f0698d3c7b6fa SHA-1: f05ef2e0cfab141747ccd80d237f6670142a2576 SHA-256: 3ebabb286f7946c98431a9eabef09952d2d5343290a9686d4686dd63932848ef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://toroisg.com/public/images/files/jugamedu.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/62953780410.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d8ca5c619d48323e8a63ccb69cb32eaf/nugisejo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c050bb74---guxiropamorapos.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c24301e839---97041189351.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/75600584849.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pexofuve.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/88327912802.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/19718656484.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xosomosixe.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/padazoxunokabatezarefi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b7576643---76221918315.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/ropejir.pdfIn PDF document text
    • https://bdata.vn/upload/files/61688070471.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/somijopapuden.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161412df9c6e33---zafuxoxilatugepuvasud.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/dixesa.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161411eedda824---lovopimigubevutewa.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/zanixa.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68125786568.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zixebowujizasipa.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091202105373499.pdfIn PDF document text
    • https://plasy.com/uploads/file/86157740622.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630629103.pdfIn PDF document text
    • http://preiss.at/upload_files/files/2775776050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=music+maker+androidPDF 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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10572 bytes
SHA-256: 16991eaacf866821af46267d0073d568028a72edd39d9bb96a864f0c79b31640
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 20272 bytes
SHA-256: cd379505d91d3c0f717f2c60a2967608eaddb6b3b01f87fe08c2ef123813d2e4