Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4baff804e6b4152…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 22:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: faf27045073fde30a02490432ef6d39f SHA-1: e46f9b82cbf31116cbc913ab905ea684c3ddc049 SHA-256: d4baff804e6b415217889088fb8172bddb8c4adc2acdcc270d5ddabaf64846f0
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS upload storage or appear to be link farms on disposable hosting. The PDF's structure and embedded links suggest it is used to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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://taumed.kz/upload/2021/09files/210913021313393381t8gp6.pdf In PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/vatovozefopemidivusu.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/pefat.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/kevasanimosevir.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vikexemebuzuzowibisunat.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/34142593497.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/45569005399.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161408e54f37a0---70568249186.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/lavuremagobigafivemiv.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/31984140189.pdfIn PDF document text
    • http://abwva.com/uploads/files/dogisujedipokemowudi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/bewafodosuxajuzofebifita.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f04b79b81---satorovipine.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pefusetagexu.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/86514830596.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/55561851811.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141727cc12ea---5616139483.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fuzusesik.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8e6861cf08cce47c602b2024719b0dd6/35396964057.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/70058503721.pdfIn PDF document text
    • http://strahyi.ru/images/file/61814030498.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/42017334713.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fesamafuwexosirolazo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/govabuvi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109011630527457.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/silurowevumowuxutot.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/xibiraxipasatinev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+app+to+screen+record+androidPDF 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10516 bytes
SHA-256: 8b4981bc8140d3159865373b9e986eb0464bdbba5537c38fc7abb550254939d4
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17664 bytes
SHA-256: 9955630207913aadb789afbe5cc474d6a11d97e7daaf0efb0c5bbb9819bf40eb
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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