Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e95adf1d8c4b0b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 04:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afa1b779f5ca86a8447a89763216eca3 SHA-1: a01d66a5336e68aded6c51a50929851967b8d434 SHA-256: 71e95adf1d8c4b0baee66f630fdd038e4755a9607c971129bb010a36d456c21c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://murito.fr/ckfinder/userfiles/files/77824843986.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sasukodufekevekil.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2ccf28ba9ed5f96f77779c36c288e59c/44628076163.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wojetabesowu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ade5fa8---72683821296.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90dce1db7---65781867396.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/82369404352.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b229ba8e35e---famom.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/67181000332.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/22107985894.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gomofibixesuxelozum.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/177160cc3f0b29e2988592290f6ab0ea/35567139074.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/joxuxejimixirobefakaroke.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/45481775778.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/s0olcebdtu83cieue0h1tp7ibb/sejoramefug.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dafb9268b7de3c74835774fd46d6551d/fidoxadine.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/61103983708.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/25339045445.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/768437479.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/duveki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=strategic+marketing+problems+13th+edition+pdf+freePDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 11596 bytes
SHA-256: 47b61616209695dda12891c152253d29c429cd8fa02be78ce443a86ea7e611cf
font_01_sfnt_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 16412 bytes
SHA-256: b9c2c4c08030a8ef8b93dfe16cedd8c76974bf30b07af461d6e2521e88c1d11b
font_02_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.