Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae73167eaea48d9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 13:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3522450590b0ccbaa8818f1fe65308d SHA-1: 13d040a768cda69b86465d3f37e09402bb298a65 SHA-256: 1ae73167eaea48d96dd1e520e3921e731baa786e2a4eaac197db35315bc36994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links strongly implies an attack pattern focused on directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pharmnet.cz/ckfiles/files/files/siwevesero.pdf In PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/lumudogum.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fukudifirilejaru.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5df6n0nc8cq43ao1i1msk63e3s/temadelome.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f09f35dc8---zelesimewotevi.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/79648208835.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/rowetiwu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087713abe1b1---64071797735.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/lupifubobowenafiz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f727990ea7f---diwamav.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c47317739623c5c0d0665d53fd9d5522/xavuselabudifalimavil.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7jt46vl580nhgqveasrhar3oad/90954196126.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kc6r351kk6mqv22q2jp9cu5nm9/94036747976.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607619bacbd4f---78051114501.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gidanukabopadoj.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081c628a1ff3---pinomopozuwejaxo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/89173950093.pdfIn PDF document text
    • https://langumeistras.lt/i/File/pigug.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b50bb2582---ganes.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/30604804720.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jobelatirenivojowu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/32733812801.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6767e00aa6---rutamujirexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=embodiments+of+mind+mcculloch+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 18352 bytes
SHA-256: 7d3f035db9ecf4d91ae03876bc9925093ae231922f81173470e07be692a52db2
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 10848 bytes
SHA-256: f5385dda2851096bbcafa645ea26779bd4e13fb5338087b4e2d382437b16d2fe

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