Malicious PDF — malware analysis report

Static analysis result for SHA-256 f141f1f1639622ea…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 01:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 545411aa7a373aac1c26673a5ba0b8ce SHA-1: 2549f5d9f9af018f21a3acb84ec3250e9db0cd9e SHA-256: f141f1f1639622ea2b63c22e7530910a2702178588849c3262c0a04f0e529c55
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thietkewebseo.com/webroot/img/files/79248245344.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bupasoligizomezabufebeje.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b9a60c9e1348506c1feed7ac2d841b38/84420906592.pdfIn PDF document text
    • http://abnicum.com/files/file/difudasupugud.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/rapisopimiz.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/xubajol.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/gibejomasitulopef.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3b6cc42c3d522631edaf1331c43c9eaf/vavinuvarexusixude.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/78255554723.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolif.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/89309619882.pdfIn PDF document text
    • https://nexusmediation.nl/files/85876011550.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/183f964cf7129f064cca354bc23a4db7/96771338914.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265716533f92778243b47c05a316cb2a/zivejowovinawimiramaroje.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sujutudiwepumugak.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/rolexizufa.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/13651557406.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0919727b8---kidasiza.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/1198573017.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kasozevabaxakuzamot.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/10512590824.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pejetoputasoka.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/rujuvunamabelawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tehmina+durrani+books+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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 18728 bytes
SHA-256: f58c898a532c03b76190799d726f0ad11f7cec77db054c34f11cc00b503faa87
font_02_sfnt_off00013ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 10916 bytes
SHA-256: a8d01e074ef945a498e40e7c6de48a4ce86e39e674132a4f287542972aac58a6