Malicious PDF — malware analysis report

Static analysis result for SHA-256 9219a016c13f4f31…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c7792ac10e1a08a6f1759db94433a7d SHA-1: bafc81e9ca31ee23ed1bf23ae9c39b58f334fc5d SHA-256: 9219a016c13f4f313656088f897e0a70953929a99125ae27c27c9033649ff04f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_RANDOM_URL_LINK heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly suggests malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=is+it+possible+to+view+a+private+ig+account PDF link annotation
    • https://joebalogh.ro/imagini_ws/gurejefiledupo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/82671144178.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xifeke.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/51603450612.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/mozigomoxasufuxapabe.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/dusunuresajagakule.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a8dd126a---87644567722.pdfIn PDF document text
    • http://ave-france.com/pics/files/zuxipusaneduwikezuwe.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gijobibapower.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305eafb9f5b---kirilixafajagepewugesitep.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/48580552356.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e0494f54---79535496897.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wudepu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/13369774244.pdfIn PDF document text
    • https://greenways.at/userfiles/file/35373485748.pdfIn PDF document text
    • http://mousike.it/img_ins/files/lupifusuzig.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/wolaj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/n1lsbm9n55mhd2lbs6tr6gl3a3/51437981115.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/vazagojef.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pubaselijivasojupi.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/20291368999.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/vefuwubivanajawixokoted.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/papozikinuvodix.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/rovuwivewodoxuxebinoge.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/dalitinigenudirawomex.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/japufopesamaguvitufobes.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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 18904 bytes
SHA-256: 1cc74bf78db4998797c4e35fb13dd5a6aa9c6ba4a9ea5361674117884df46745
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 10892 bytes
SHA-256: 3b5e94d707754b4b076072402a6d9bd7cd50617795031c1f0cbbbb19b1ab7d39

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