Malicious PDF — malware analysis report

Static analysis result for SHA-256 4600d37b258828c0…

MALICIOUS

PDF

89.7 KB Created: 2021-10-06 05:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 114f0d621e9a259aac605bb5e25b9c50 SHA-1: 4b84db64ad1333dac31e6854ec6df73fe04553b1 SHA-256: 4600d37b258828c05fdc2a8deb6719adb63ae5de981d4f6372c60ee9a6aa9467
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm for distributing malicious content. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common technique to bypass initial security scans. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thankschicken.com/uploads/files/lazepagejawigivija.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a93312f14---begitosabapuvexi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/39296199512.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/4379224437.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c227528241acb519cad01faa275c7530/xenapiruveminenudixo.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/79524487105.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/74661437014.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96647084603.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/goposisum.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/91682084268.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kisaberigekumibutim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143017016d97---84024316958.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/redepebusanobedopaxi.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/84808037864.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/89085604623.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/xepokisuxumula.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/60071115742.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/10887280264.pdfIn PDF document text
    • http://usagimatur.com/files/others/44301946564.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/nasetetixuluxuxunamudotur.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xazavuvulowiv.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/xubojexefaxo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-30/20210930195849221508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+clean+up+a+poorly+scanned+pdf+onlinePDF 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_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 19100 bytes
SHA-256: f8f2b64319f33171725383b9a47de7debe59ff8afe954883ac7c0fc651b02459
font_01_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 10904 bytes
SHA-256: 60fc29f7626fcfd442b3011812e1b169f6ed7a4c4a6db63c160d3078b1c0326e

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