Malicious PDF — malware analysis report

Static analysis result for SHA-256 529d3bf1ae6c89e8…

MALICIOUS

PDF

87.5 KB Created: 2021-07-22 14:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3840385e38da32fcaa403229fa2894d SHA-1: 84d8e91f153e4ac81647a12e025b370dc5a6cdc9 SHA-256: 529d3bf1ae6c89e8151fcaede5386d67122ab970076124f3d994a8f7db39a345
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised websites and potentially malicious files. The presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics, along with a high ML score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The file likely serves as a lure to download a second-stage payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mytekas.com/UserFiles/file/musudulexajar.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/36107516817.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdcc82dad0---mufotizowiwezalozixu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c09a87d311d8ca43ceead19485ceee14/76839357871.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e12f207e---44084445154.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/35732746800.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1abcf52f---8100796282.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/97869756962.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43001b301---zonivuxo.pdfPDF link annotation
    • http://thanuyentea.com/ckfinder/userfiles/files/joxipigomufotiseposeniwif.pdfIn PDF document text
    • http://ave-france.com/pics/files/86944363064.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/96d4484f707b0a2de7453c444a86a879/14458117530.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/16096081369.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/360eee37ae8df3f2692ba3ebad4f2054/suwojereguwoxadage.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87350421aa---zatiwupudedamovivim.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8nihlbkrrecou5am5o3t9hmp57/vekebimapojoz.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/16186811987.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/11319627811.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/51332748273.pdfIn PDF document text
    • http://uci.ir/userfiles/file/saziva.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/24763937866.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951f157d303---zomirufawazirenomiru.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/938d54fdab2cba310b7656d2fd32fe10/ragaramisezopakajanexiv.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gajitifuzubofobuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=different+anime+art+stylesPDF 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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 16880 bytes
SHA-256: b828feac02d8f988d081e3bddb8beb637fba8aa49e614d04ec6cfcd728a4c529
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 10372 bytes
SHA-256: e96ea7ff5d2ce3112b1507a5c46103b497002cd14538ed75cf454dd3d8c39bd6

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