Malicious PDF — malware analysis report

Static analysis result for SHA-256 08076fdbeadf35ae…

MALICIOUS

PDF

87.2 KB Created: 2021-08-08 16:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c68736cc5ebb1ce51bf98e200ede612 SHA-1: 2e0d3c05167e01cbae4bd37914036dee1d7e521a SHA-256: 08076fdbeadf35aeee6cb37e4fab5442a2bdb2101733cf99900c69d3ad8c5eab
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS upload directories or disposable hosting. ClamAV identified this as a phishing trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious content hosted on other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://vekosgroup.ru/userfiles/file/rudemajil.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608571d6cc88e---57433473192.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/63185097742.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b34475b1c4b---pijasefawamelurem.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/88736488701.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1b593ac142e1dd4b2064640c9032c059/30283983677.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/47863461835.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/7975865054.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ee373846a62---gatopazaxuviruvam.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7c1711e6eb97a27ff5d53d5eac4a2800/kitiranusupo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e49832d92d---rinelenimujujafibes.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/55386641465.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f99017584---38156837650.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/naxebisubigomujax.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c018a5edb---repomikinapezoruwinuvewar.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e829cbf3f266b11d58116af0da5fdc99/37201357136.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/92418151158.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/govajujarurok.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d2cf47f00dcfea3db91a13b166b2064e/1544653666.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9ec301c4---nulenowoten.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f03110a0208502ea0fe0340af38109e8/xutupowoluxixanofim.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e3c64e2c8---43727444115.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/xabejokawozakejukanarik.pdfIn PDF document text
    • http://german-ex.com/mamokelofolorefekenusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=westlife+my+love+lyrics+video+free+downloadPDF 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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 18316 bytes
SHA-256: 0464adbfd3f050956610adffadb3398902f39df8691026ee256259a5389f98cf
font_01_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 10896 bytes
SHA-256: c55106935a8a454766a7490c36dcb293f3f5134d60262249ffe23237a6ac7bb4

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