Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b5d6dbbe580bd0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 10:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae28fb251ba7a4a8e97747c8ca6ff5df SHA-1: ae38d13da6ca21b0cd5f7f9f96a1d68cbffb87ae SHA-256: 75b5d6dbbe580bd0cd6b83d9642843441cd29dc18f23ca133854151771f19ebd
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm and a callback phishing lure, suggesting it is designed to trick users into calling a fraudulent support or billing number. While no scripts were extracted, the presence of multiple embedded URLs and the phishing lure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.alexgis.com/siteuploads/editorimg/file/gigawelo.pdf In PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/lajaxodoweritemija.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021652306282.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fdf792b9---fivop.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74376506834.pdfIn PDF document text
    • http://idcla.net/upload/files/sunimizatimuzubozewu.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/54449335034.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/257360d370de8756a9c4c909848f86d5/kotadixusakolugada.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pinodexatupimifiluwibegoz.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/81575713792.pdfIn PDF document text
    • http://tulga.ru/editor/files/23400942701.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/xumusenagarexavobomaxer.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/6074521938.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/79024221487.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/badejapuleduni.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/61610898300.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109091207489583.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/97671243302.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/vofifufovuretajitusax.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138304c2858a---rebusujew.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f2a9a304---94630392370.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pabeniloragamorodadaraju.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kifibo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/kelowalijadiwekubufobo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee746c61b8---80088280756.pdfIn PDF document text
    • http://autodilygood.cz/files/file/18771762958.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/62332001506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=use+mobile+phone+as+web+cameraPDF 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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16944 bytes
SHA-256: 834d68f43d7dcb04fccc47d7b356d09629b02cffc307e84fdaf445858160fb84
font_01_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 10772 bytes
SHA-256: 89a2e17f463f3c480e910009f8a4e39d142bee869c20823d2ccf80da7badb80c
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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