Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac75219c46526c5b…

MALICIOUS

PDF

93.7 KB Created: 2021-10-10 18:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9644b160a9ac96567fecf91dbba954f5 SHA-1: 804071ad08114c2286d7b15b67131bc67c649c87 SHA-256: ac75219c46526c5b56e67574bde8c74848bf89a37654d8b82d8b9f89a5e39149
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, specifically a callback scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8a8850e33171a06407b1d0d87ed4823d/24349183711.pdf In PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/suwerirepewezi.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/pokajevurebekexowut.pdfIn PDF document text
    • https://mkontakt.com/dat/file/29565921519.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb91f04c3---munewelunotewed.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/pitemaxiz.pdfIn PDF document text
    • http://mqskin.com/luutru/files/44900035603.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zesuvikegegot.pdfIn PDF document text
    • http://salespate.com/userfiles/file/49434940396.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/23310240369.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zopejisupepikotobefopeze.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0b9becfb148d15f51ba63cca028c1821/zarabetazovas.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/fanubediwagikero.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kelono.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/14194243471.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xafare.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/zixuroro.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/25081565376.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161616c6d702ad---87940729648.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/47020421282.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/96282872485.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jidemilunawibewowufuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=6+of+crows+netflixPDF 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_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 19856 bytes
SHA-256: 97a8abd53cfa2e6498ebeae9d61fc0971b2a38aa713e7cf934ed1f18c39ee128
font_01_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15193 10424 bytes
SHA-256: a95a606515cf994d71f4ecbe804a0aff68e153e8f7e02c0c269d6d89c2895e6a

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