Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93019132007050…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 01:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a79ebf9f73dbb30c9d6b0a42bf7dd9ae SHA-1: 43b6c7eb13fe974552979b54efc1e71014fa67c6 SHA-256: ef93019132007050d9976a7e2d273a4c7c288595d8e8b955a451b9b2308419da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites and disposable hosting. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely to trick users into visiting malicious sites or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bompentax.com/quangbasanpham/app/webroot/upload/image/files/loziji.pdf In PDF document text
    • http://hanyuchina.com/upload/files/45478041207.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/10228156883.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161449ec253565---jiwivajadifujijuzavag.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/rasizomeboxuri.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/kixupobuk.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/judamobixujelejabegimatux.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kenoja.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/xemojuvujajajanaz.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/laxav.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/638f9d2cc8820365c0a37ac20d074fa7/44720652395.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/tekavovumorilisafelidel.pdfIn PDF document text
    • http://edituj.cz/res/file/72108653756.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403223a7af5---31305993814.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zanogoxivowi.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/bolazokod.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911043834957886.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/22544939128.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/13626631370.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/mofusideligekatugabi.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/20257091707.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/43773670912.pdfIn PDF document text
    • http://fgosvo.ru/files/files/2593532376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=arcade+golf+neon+unblockedPDF 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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 17788 bytes
SHA-256: ade8a6d9e6863362b19a6b9bfdb6141beebe8e9d9906bd2f992205597e3e89d1
font_02_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10608 bytes
SHA-256: 448af669518f85a17a2910dc6065feca5a62f4aa9235b00066ff56ec8c6ab254

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