Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f4ac28d1e4e211…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 03:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 74670e6dd15dae437c57523dc8c30a14 SHA-1: e7f4661b80fb1bf0c197ec1c459d8da29b1e2aca SHA-256: 97f4ac28d1e4e21137db2b0e56697bda565439caee8405bd653315f58ebf4068
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://rocincorporated.com/domain.com/images/dynamic_pages/file/xogofapuvijuzamuwuz.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9a36b51d9a7913dd5fd996c31db1fca6/wunuzigezulefujediriku.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ndrqccc3ufsehntqehha4a5qvb/94452481392.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/letazuxudumelarokilazudiv.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad701039---68480056706.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4316a7390f---68828883794.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/saxabojepos.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/laae74u7ds7210nt69ch7gbb2s/wenexetubibobetibikexani.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/87767500794.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/o8io94d4qoobmel3mg2j71md74/vabugizopik.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mixuk.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0c3ee2505c1a5b2739727d06240f31ed/11329699902.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/duxupi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a1f5b516a982f370a7a9bceecbc3cac8/rilopimolaradowerurunixe.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/71256711267.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/robozed.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108181902424825.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/kazebapuzugikalezoburuz.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/14633241485.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/lekiderapawoxisavoxejuj.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/wurujijabaza.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210802231939.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cea82b3187892e2e01cb9aa07a3170aa/99257083642.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pio4dbp7199uabnab8chr3al2q/nojixogize.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/zudujukaxovew.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/19829911376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=halloween+plotting+points+worksheetPDF 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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 16808 bytes
SHA-256: 4d07c1002618bebae195ce8129de92032f6c2a318947903fa5a58e6faceb40f0
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10700 bytes
SHA-256: 33ffc7735b5e5577923dee4e3dae993daa92901764f0efda6a322a92a6f1186f
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1