Malicious PDF — malware analysis report

Static analysis result for SHA-256 af90dee241b689d5…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 01:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 399ab524d6854cb5e917e3e6c4c20edd SHA-1: 03ba31cc678d4cfff18b33c8898d70f58be26044 SHA-256: af90dee241b689d518f1e4e14d842e3ac3ef8a8b78a32bc078eb98dbccb797c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to compromised WordPress upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc6979b739---vesipij.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/narenatemilotitewubew.pdfIn PDF document text
    • http://chromatographvials.com/d/files/zapejagukepav.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/89i0k1at7i72btgmh2vtso4hd8/vujexolapa.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/13648330054.pdfIn PDF document text
    • http://calisnt.com/uploads/files/2963416063.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7ca6d413d28adcf41511ea729c6c1789/berejikobonol.pdfIn PDF document text
    • http://elm3rad.com/file/nukexerufimiwepojukidis.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05887ae1a---93385223167.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c75cf99c7a3---bapelemesewikelun.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/54960264150.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/52582146711.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b006f50da773d35f2c26577a4066371f/wamazomago.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/nphffddr4ja7n6v5301bhq6cd1/kexupuvenedewax.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/fawedukedumariwozo.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/23014752881.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0191adb5---55750969612.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c580f2560b3---37510502174.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe8b4b0eb---86866819009.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/titusinitifusosese.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/gelov.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983615290ac---81630990017.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/bobisajozumefuvava.pdfIn PDF document text
    • https://greenways.at/userfiles/file/mowegibelijipuruno.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/91007536106.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/39472738188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=weathering+and+erosion+reading+comprehension+worksheets+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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11192 bytes
SHA-256: 74c4224dda66bd55fed314a86369aac560ad5e06a182dbcbbd57f544278b7681
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 16340 bytes
SHA-256: 3875a7ba0a51f04cdeb9c709bd6d186883d1053f3ac2b4c410f565c944aa715a

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