Malicious PDF — malware analysis report

Static analysis result for SHA-256 97152abf7322bb90…

MALICIOUS

PDF

78.3 KB Created: 2021-08-19 01:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82a7377e709daf89ee08ab7932b8ebd3 SHA-1: da83517c9cc9568bfa1239b4557babff3044dbed SHA-256: 97152abf7322bb90e3a03ae345bb6ca41b6509e4426c304c079d057a1e6c242b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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.
  • 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://medvor.ru/uplcv?utm_term=full+marks+guide+class+8+science+solutions PDF link annotation
    • https://educhina.mn/editor/files/69608163833.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edba75d457---jazaxibobejiguj.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xenirosuzali.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/busiliv.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/36432255599.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93c760ab2---27403358007.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/6698191323.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p06cnu7q7ecughpd82bj7110v4/kuxodebiduvova.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/31782010343.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074761a260bd---koruxata.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/15350183137.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b32e4dc62d---13707801231.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/mixufosolakonifetumonop.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/5134813474.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/kexopotelopopugisej.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/namegaledarubewusibo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/15546415213.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099065fca8c0---7114839521.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/salitod.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/winokumer.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ocpq6ude7c4r7evcis6b56c5go/gatot.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/lemirisiwezorijozirir.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/27539146218.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160893edb65dc4---ketegukodazinawaro.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/risep.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fusorewilikolipojo.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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 15736 bytes
SHA-256: 23b1cccfcbb8aaa41ceb8065029cd994d3224715ff815c66cdc149099ca36fff
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11088 bytes
SHA-256: 5be49b1c3cc2ce903bb84dde30160c911b722950093bdcffa45704af462cd369
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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