Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ad4433cf922a05…

MALICIOUS

PDF

160.0 KB Created: 2021-06-30 02:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: decdbdbb668091807b3901a829d603e7 SHA-1: e5c7fdcc6ca369f4b74934e04adf97c5ecef07ae SHA-256: 18ad4433cf922a056374336d783516385da3c10124be381e9dacbe6909b56a2f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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=black+clover+english+dubbed+download
    • http://beiwendq.com//data/attachment/file/95635921459.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7ee54462---nogajutu.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4bad30748744e8a68cdc0620f7f58f92/zijiwasabarijipofedob.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e92adcf54---letudukuzobas.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7c69217a---vegev.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a4986d47---56823682387.pdf
    • http://hyundai-dongdo.vn/images/files/pamutedofowilifip.pdf
    • https://muratay.nl/userfiles/file/14915478377.pdf
    • https://avvocatoboretti.it/file/58224327925.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2c2a4c7044cc9c211af554c339f7c60c/gigadirejokobux.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8eb1t63icn8qupcf39sgigh4vv/17845715163.pdf
    • http://brezov-gaj.si/uporabnik/file/94913297924.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/famuxovalipixusi.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/89775c6e78a296a2546ea79bf302c133/19164206096.pdf
    • http://sungsam.net/userData/board/file/41759578122.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a809196ce01---93774833545.pdf
    • https://kingcarmotorista.net/uploads/files/21086938219.pdf
    • https://twr1115.net/files/fckeditor/file/18286215884.pdf
    • http://biomassasia.net/data_ed/userfiles/file/wagubat.pdf
    • https://kund-in.com/userfiles/file/1335867663.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b473f7e8cc1---78501940465.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e06d5f77b---82440221454.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014626.bin
52fbf97eac72422295405b9ce8db41213318e8319fde02d723993d791d5c1355
pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 11088 bytes
font_01_sfnt_off00015fc2.bin
69f927d6804ebfc6c214289da2102bade0fda1b4656cdc9c1214f2ba8370a2f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC2 75836 bytes
font_02_sfnt_off000226e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x226E8 16792 bytes
font_03_sfnt_off00023efa.bin
c5ed16d2b018345b1ad62fe7e77c0f61047b5ba9ae7dff2351599f7d2dffa3be
pdf-font-stream PDF embedded font (sfnt) at offset 0x23EFA 20312 bytes