Malicious PDF — malware analysis report

Static analysis result for SHA-256 4651034ad7a535f9…

MALICIOUS

PDF

88.6 KB Created: 2021-07-31 04:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: acbdf3be772e4532d8f70476402c71f9 SHA-1: b672758bbabf07c189dc7fcf69f164f109ab2abc SHA-256: 4651034ad7a535f92a0df643f1226e892fa7dc426b5ca44d48735febd8bac365
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1598.003 URL/Domain Information: Link Predication

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It functions as a link farm, directing users to multiple unknown URLs hosted on compromised WordPress sites and disposable hosting. Additionally, the document contains a callback lure, prompting users to call a phone number under the guise of billing or security issues, which is a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4218e10ac5---kuviko.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1de1555---bubotadubifunetut.pdfIn PDF document text
    • http://15889163.com/ckupload/files/57901743053.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/retirururozopetote.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d4649c449467e9a4e04e4d9e22bc8c16/ruzemobaterujarepene.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d254e6818---2843993842.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/jeduv.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/30667562015.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6c288f79---dajuta.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bb206644---72627739937.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/847qqet1i9l3e8g8s70f868uc2/zedirodepiduloxirulunuri.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/7261781852.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/mafisazinigisewitasis.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/rikupikuzodar.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/499fea1b0ba843a27bff9b6e4e9813ba/87993380078.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1852b15573---tojuzijunisujitoj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56fc3e035---10691545759.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/30522528915.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/af749346bed2218629b98d2f513d4189/52626865952.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/888d5f5b341043be346d82fd994c03ae/9077238305.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a116486562e---93252504060.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ve1cj1c9tr32rt4c69a74e00a4/41400400414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aviva+group+term+life+application+formPDF 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_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 17348 bytes
SHA-256: 420247bf67bd31cf55413ceb35c3090c1307f319f19cb8aa263e27dda10d15af
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 10804 bytes
SHA-256: cdc848cdc096682f9d4591d980539e7de89f2705d075e620f847b6b870c6e65a