Malicious PDF — malware analysis report

Static analysis result for SHA-256 a723bc1a71b75da3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 02:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 83ca48f4d6825b93995e159d6160a012 SHA-1: 13974aeed856f6cbdcef3de3f0610f101242deaf SHA-256: a723bc1a71b75da3e08e247145a433e7982994583e3daf47f1a8930bd0f29178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs with UTM parameters further supports a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=bet+download+app PDF link annotation
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/bepelobinamederopoba.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/papemepuz.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tuvokezifodunewuzimusir.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gexewovomukabotilubuvufe.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021923156184396.pdfIn PDF document text
    • http://fteq.ru/files/file/xexabaxigixalaso.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bifazadowedugifolaguna.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/722296b5aed7d923a8ed1bbf6c7731d5/76148699013.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c30001d96---87264526327.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tipegokana.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/pasujixoz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8ffb49cf1---30109015240.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/75702756873.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/62072108949.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/30214041171.pdfIn PDF document text
    • http://npas.ru/pic/file/89931845944.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/pavalukivif.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/95995822736.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jarebazut.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/39584473341.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613086180e99b---dogarukabowujal.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/24222483055.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6annmh8lp51hkq38hb0917cipf/niruseputixafodoronid.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/famezaviboj.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_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 15940 bytes
SHA-256: 84fd03ae771939f5f742484f78c7e8777c856396b9f4fcdf6859dfe52cfcc48d
font_02_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10164 bytes
SHA-256: 96ccf559dbf8ae6936f3907c9750f57f383c788a9ec18e2b091a810f58be0293

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