Malicious PDF — malware analysis report

Static analysis result for SHA-256 55570be7645f0b02…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 13:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a625487659b84fc99540d448cdd40972 SHA-1: d038a3016d63ab207d7b04569f051908bac1b3a3 SHA-256: 55570be7645f0b0296f144da73dd86f41c485b3885c10722ae135d88d1e3b4bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pixomot.ru/uplcv?utm_term=tada+time+apk PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321e053bfcf---pawawozikosememupo.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/bivibomuwarinotixipur.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/70400513.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354166baa---8158499198.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/rometiravobemubokodijip.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • https://magatek.com/documents/file/patiwamazalodajifevufav.pdfIn PDF document text
    • http://ausafe.net/images/art/files/13314226013.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/buxasadaduvefukasa.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/luduru.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/jakokajatelowadorolo.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/88223325965.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/nadopezixeg.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/8980501118.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd3a91bf6---7176120075.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/livakejuma.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/64517260684.pdfIn PDF document text
    • http://jcpingie.be/public/files/78083657469.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zugoke.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/demosanoxumeju.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/xogusikikejivaxir.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/40008627203.pdfIn PDF document text
    • http://www.grifin.sk/files/53983259948.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/nadirafeseloji.pdfIn PDF document text
    • https://educhina.mn/editor/files/86455278583.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_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 18496 bytes
SHA-256: 52fc8117368aad42a795578e5764033bd1cb950d733c7472b85ff7d70d7eff25
font_02_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 10068 bytes
SHA-256: 400f959b901c63efd19465961885a939e8629207b52ab4d3e403ca6c8e592756