Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d7944c52356b77…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 04:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4f33e5df432720401b32170fd921f3e SHA-1: 1779f7be233e03c37d08fb5362db933200ef4b03 SHA-256: 84d7944c52356b7766bdf4ef29a6bf7e705c59ca5d58963229f394d27d03083a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were extracted, the PDF structure and link farm behavior suggest it's part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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 http://allg-gyn.ch/userfiles/file/13985682334.pdf In PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/xebozubeli.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eea616df7---2982298163.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sojiwunevavifuparuvo.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/mimagejogaxadi.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/490542640.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6b8ad71ca199abf71a2004a2f3a43d44/jopiruwefajomijobexu.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/noloxuzerotitetutudikif.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/pejirebolalo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add212df16a---tixolewoxevenudikereruwo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/sovetaraxaguxitidufupite.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rirevezovaw.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/muweranetufimab.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1363d1ce42---pakarori.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/22742759551.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/bekiboziso.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fujifetagijotowalikum.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863e0aad209---voxusojudigule.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jutaxepimube.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf6298ac4e---sonadut.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/zotegepetezewi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/53a2amtl69339lt7b8gpuhb1u9/vokusuxekizovum.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/miketixedadi.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fakewag.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/sedarar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=over+minus+glasses+for+exotropiaPDF link annotation
    • 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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 15524 bytes
SHA-256: 332d0bb27e9bd587a40c95237f2e0be7af1eb00127b98189f2e0c3a9748cbbcd
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 10992 bytes
SHA-256: 9b563d4701d52177924b1e632fbb281f2a36ba5e9487b188f0d514aadb3a7dc0
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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