Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829eb161508b541…

MALICIOUS

PDF

96.7 KB Created: 2021-09-07 02:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bd71754340374a59caa0c864d01a165 SHA-1: 4b0dc7b986d750f6406a4c913156887bf8a624ac SHA-256: e829eb161508b5411d47ad0b4c7258d581a0dd4c544538006135d2a872b181a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, designed to redirect users to potentially harmful content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soft-pro.hr/upload/datoteke/61478521437.pdf In PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/l6udqjkpfehqgvsgjhji68m5sh/sudafujiluko.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/koninifakejekumejigun.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/40967542227.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/vokulizajusatusujapidut.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba78a94129b---49597471385.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/48022316551.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/55359224855.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/sugolalifunomekuzeroz.pdfIn PDF document text
    • http://cocoal.com/uploads/file/43992054809.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/8516929109.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tijojonunoz.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/55465203074.pdfIn PDF document text
    • https://activepymes.com/pub/file/60095262425.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/guxata.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/pubekilozedubetudiwutu.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/30525380265.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/losabefubodi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6366e0993b82ee85e1f950cce9d07554/9579012947.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0iknp3o9krp1ul0kj0p7o3jbb3/rurozawegewugotoguk.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/35838394512.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108280727364196.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jududepatixamijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=grade+6+maths+exam+papers+2017+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 19176 bytes
SHA-256: 4375f53f8fcc11907997283f59d354abe60434390224b6ca015a7cb7c0da544d
font_01_sfnt_off000142fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 11052 bytes
SHA-256: 600c632596c4c931568ed0cd5952be22c4c98e343452f5beb1881fda4d2c8343
font_02_sfnt_off00015cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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