Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a9d94f9a97350…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 20:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7abb7debac0d40618338d06855a3151 SHA-1: 8a8ec92b2705d5c6d5efa42ed018cf01926d4d7b SHA-256: ea3a9d94f9a97350a0e70fb6755e7fef37caf53c5d8ebe18333ebbc6cd206296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

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 https://drafthe.ru/uplcv?utm_term=putlocker+the+new+mutants PDF link annotation
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nivofoji.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/43834077443.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/zaxezerifib.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/13975444543.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zuzufubusolo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tejat.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/simakalifebites.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/retena.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/17357637057.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135708f78abd---53300485871.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/47637320890.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144a06b7a7d8---zovakemib.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/nogirititebilapuxuji.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/88789042077.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/vagafefox.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/39062980204.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/17980158269.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/bikagemaramur.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nojenemujejesonop.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/68052874315.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f5a6732b---48182550000.pdfIn PDF document text
    • 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 18712 bytes
SHA-256: 1083d55983a29d28301d386c2629139a1d0aa86499b4cd1e625ab2315312cc6a
font_01_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 10680 bytes
SHA-256: d9a4bdf5909589388acb812a3ed28449dbf5ced8f2c0dd9377bbdc8f55677bff
font_02_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1