Malicious PDF — malware analysis report

Static analysis result for SHA-256 1450796d50d6f83f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 05:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39a82c726af9d8c4f9d99654e8f8eac2 SHA-1: 1b69aa8f9039fec888f1020cd247c1e24badd052 SHA-256: 1450796d50d6f83f12fd925d0245d14d490f190212d3167547e07abc8e6af336
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download a secondary payload. The presence of a 'Download Now' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=ireport+manual+pdf+download PDF link annotation
    • http://ty-int.com/files/files/zunovexudesilawe.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/seguneverutodivumipelul.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/vikegakuvosim.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c83b398e840f73b66cf55a5431e52b06/84157239746.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezozesuridipap.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tumelodemakufal.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ef90d54c---nekuvofonixagunurinaxujug.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/robaxozabovopejege.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kufagogowuwafejutipesigur.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/vodajakolisuvobinadiba.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/12668407830.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/pidaxonodopor.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eu17o3nohrlgtfg9v7ef4evmv3/73825331429.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/fugezupifewufofoj.pdfIn PDF document text
    • http://flexicourse.cz/res/file/9810856920.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/7174345406.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/rugisifuzinajararosuxadij.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/717121fae0c66faf2be64d6522f7a7f2/faberelikomeri.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e0e8cbcd---30352591994.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tojivajulesitulixetiw.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/fevupoxotofevimexezur.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210601053255.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b46a67500---69746353532.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/nofikelafufiburokigavivik.pdfIn PDF document text
    • 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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 17776 bytes
SHA-256: c1fc24194309893c89a9765800d5037bd2bab8dce871955cac17a02ab64a8ffb
font_01_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10536 bytes
SHA-256: b51e7a6f9e295fb8e18b341893b0d0c6bbc51a7813a9b7bd0269c250b70c5d4a
font_02_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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