Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758b824ff8d5019…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 20:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 893f0ec6d18c0c5b44895394433240b8 SHA-1: 9b2b1de8fee9e4ddd860d1ff5be2220130339226 SHA-256: c758b824ff8d50194d956c127abb8cfb5951ee5d2e66267a855a7d973ee19498
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=the+epic+of+gilgamesh+andrew+george+pdf PDF link annotation
    • http://bangladeshceramicsociety.com/uploads/editor/files/85405344836.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e65ea36f---moxuxefunufovelagoj.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/63673508146.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcc197fd8---zopidukixenebegujefe.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/31959372933.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642cf87c2e---99839072615.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/12164423674.pdfIn PDF document text
    • http://bscartridge.com/pic/butuzujuka.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/gimomuxe.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/beviv.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/68451585764.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/keborenejeleganif.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/94812649460.pdfIn PDF document text
    • http://aven.su/userfiles/file/94543507854.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/91135805413.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210902_B771E824F305D01B.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/35054914666.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344ec92dec5---95949018811.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387effac8a5---43298107705.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74641551824.pdfIn PDF document text
    • http://isvpro.com/custom/files/66514488420.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/getirimumonirureluwonago.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/85683000348.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_off0000c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BA 17156 bytes
SHA-256: 5d4231a09b3480da1036c45fc2ef06ed58459274a0d122219b2fa4818c778d31
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 11016 bytes
SHA-256: e302597eaf2889c2dbbe2fd3268b09819a31f7eca9dd695310558b4e916691d9
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1