Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83cc33732372811…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 16:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45ade28ee6dc3cce7a14deb6262566e8 SHA-1: 64a49e7094363a6ecd798642f3763a7364385359 SHA-256: d83cc3373237281110d6e3102e2c08730b317ab9aab6bfd4e2320d32f976ae53
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 numerous disposable domains and compromised CMS upload locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=classic+train+simulator+mod+apk PDF link annotation
    • http://zhongjiukeji.com/upload_fck/file/2021-9-14/20210914150430872975.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/20729994077.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/51002767419.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/47064964072.pdfIn PDF document text
    • https://ibextrail.com/editor-images/wuwetogojusurub.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/zasosagurogalefagulakin.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/48340374160.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wamapipojewazojuvafop.pdfIn PDF document text
    • https://eetravel.net/file/jokaxewenefidulowusi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f019552b---betabedoxafafezige.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/bejajepizomupub.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/98635662600.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/50594634300.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/filika.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xixawomodokusuwanuwuwaxun.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tarokedonibijijiketalo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/64f350338c74bca41db8e27514b5ef36/4658543748.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pozevaz.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130d371c7e83---79797870595.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0b1bfebd3398b0be2abdc61ab0f8d7f7/gutasuligomezilejogofuxi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/32748f66072f9acf552b1411606a31ec/dagasobit.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/muwikikitib.pdfIn PDF document text
    • https://lapdonline.org/file/mumebeluzireposar.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 18100 bytes
SHA-256: 0d62e5252fa2fa07e885c3f4168f15a6960e19a83ef598746b51acc62a42a47c
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10764 bytes
SHA-256: d3a304d724e38ad2f7d73e6da94eb59459154af6f6b5161426c6939f410e237c

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