Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b637b58b527351e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 16:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50e21b5f4d0898b6a55896cfb3a60946 SHA-1: b2dbeee64edd6a939f2acbbfcba9c49ff26786c5 SHA-256: 2b637b58b527351e189201e9e51e097df97142ba8381b9f03127eba444f6374c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'medvor.ru' and 'prshots.com'. The presence of numerous external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=yo+movies+downloader PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/75072703028.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/lokoxepar.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/83633712400.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/ranawebowezexub.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/74238225553.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393765b2663---9734953638.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb71de279---31667464780.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/jinimeg.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/74458055727.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/43681580460.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6452a22e2ce462c4527b7cf2ffa9fd0f/binatofiferiboxewawugur.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407f7c9dfca---xekefopupilupoxobaniz.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/51562584840.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/mijuzejiminepilomapej.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/xusuwoludokeb.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138291196adc---33658548347.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/legoji.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/detixezubazapujelabupuxeg.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/jewetazutuf.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gisejesulog.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kilebabewolora.pdfIn PDF document text
    • https://pratham.one/file/84310279083.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/gejikuxawakegakov.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/13681336720.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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10444 bytes
SHA-256: 59ddf8bf1a519d46ca005c7da0aaf8075c1c20cca27496b094356b88de7c7595
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 17704 bytes
SHA-256: 0a6e143bdd04636237fabc3c3b3db4cc47af5a9d3f85cf88ceded286d15590f9

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