Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780097f21148cf6…

MALICIOUS

PDF

88.7 KB Created: 2021-08-19 08:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d6f598be3bc7018d4341ad8a48938e2 SHA-1: 26190527376b8442ed700326d49eb376c4f0a615 SHA-256: a780097f21148cf6556c3a8f994cfdc13671831aa9a33a39e733d6433cdab8a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://fujiya-burbank.com/uploads/files/38679990808.pdf
    • http://loscogliodifavignana.it/userfiles/files/69322014378.pdf
    • http://brcassociati.com/userfiles/files/56301690649.pdf
    • https://cleaner.pl/userfiles/file/musanuratazanuze.pdf
    • http://broorybulldogs.com/clients/33993/File/lifurutabibuga.pdf
    • http://aire-limpio.com/img/editor/file/31811554375.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58f2ce192c---figoxonavakowejibubuze.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hsbc6bk99dk21ocqaq2peri6gq/rigafup.pdf
    • http://hb1004.com/userData/board/file/judimogurafunupa.pdf
    • http://orchid-daikanyama.com/userfiles/file/68661967691.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42641869671.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3b579962---rulakemi.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e0ed6819---32821343455.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/52985720144.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d33ad35df8814d52ea02ec2df5da61d7/jeranavuboputovizebawa.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd4f85998---ponowiresilumowagaxopise.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vebezijopos.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h97fmd1866udu91k80kmcfsvc6/44186712585.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa574887a---41792833572.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c76d022a---24583385522.pdf
    • http://antifftech.com/uploadfile/file///2021050617311756.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dc7e9611a74e7461a6ce91ec839650cd/30114506752.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608de6175872d---79802205891.pdf
    • https://biothiennam.com/media/ftp/file/4402184622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gravity+falls+weirdmageddon+theme+song+piano+sheet+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34c.bin
510a3c0b369c0a59e79b34d16fd2a6d5d51b07b54a76833845da78fd54b26184
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 11472 bytes
font_01_sfnt_off00010e24.bin
59c6c4d3e776c7bffce6a736f6dd046dcae01d6dd1911933c8d6447d9cff8543
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 17012 bytes
font_02_sfnt_off00013a35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes