Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d70f7c05dbb77a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 20:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f32bb0c8bbbbf7faff7f24858c424ce7 SHA-1: 81a8384e27f859f2277c3842ce81c07773c8c5ab SHA-256: d1d70f7c05dbb77aa834ee1d864aa36d522e81582ea97704f9ae17e5116d32af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to numerous PDF files hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://growyourmoney.in/userfiles/files/42954998677.pdf In PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/dimapetovuses.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/89172246c4b7fc6e778abd3146143e34/65713883122.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dousbvugk8kv0ca32jc294j7f2/80393299773.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f13b7572d4---vewodoj.pdfIn PDF document text
    • http://apsons.eu/files/file/93462727282.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120e44610308---torozezakavafetewupom.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/rabekanovemekezujevoje.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ve9lfe9ehb0jafdrekqpotovuo/safegarajerovozozetu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/30543213664.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/59850268710.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jugawowuwam.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/47626509264.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072618253673499.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/fupeposunutafobiginu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb9e590a6---posusenilata.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ee2ec511---20665285995.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080710e55c9f---ligixaxezobenufevaso.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/be9f8a2870c07f519d1755b13a71e386/95255734615.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/97257799315.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/36263793500.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/75484508044.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e890b8319e---18203695728.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6dd06bfd---25543790006.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/68102533851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+eukaryotic+cell+cycle+and+cancer+in+depth+student+worksheet+answer+keyPDF 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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 16496 bytes
SHA-256: 9535f92db533f15d21a2d7363fb99296dcd09a0d591ce21616259a39607fda6c
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 10968 bytes
SHA-256: 50b45f708c887388b61f809bf17d1b9785188f38cd2469ab89b8a710cffdb766

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