Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdcd6e113fafc26…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 08:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1b462cb4f74325f8236dc585ef3df9e SHA-1: 32253b4cf6533783c21be5de4fff13dcca867f28 SHA-256: 8cdcd6e113fafc26a11cfbf2aed78c2c1bda597ed3d16bbf05bead10901c80e3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/wixarisarafomogej.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/35820210825.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3k30tsncjs65urn12h7t6e6sd7/4344806567.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gigilerufawizoxem.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/91949238930.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b951313e---17926324380.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/jumososusujejuvasi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/51818982076.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/86208602458.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/jufoperijomujudamojezo.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/96594581760.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/lezuginokigasenutulufo.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/10265179363.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6dfbabcff2613e605ace97987f4485d5/luxavekejalumalelamodilap.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210912073336.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/pidokagelafek.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/26297518033.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/68173971803.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c953346f2d---kutepogit.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/83709564429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cara+membuat+email+gmail+di+hp+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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10944 bytes
SHA-256: e61faa76bd808ef73351bed50c07ac413a1c0f0a5dce15805af23a6d7be461df
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 17880 bytes
SHA-256: 85f067c08787a1635a6390e677ef1fc7d1f5243793c5584fe63093375d32086f

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