Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6f8c7ef4bddc6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 19:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24ece3f9f2925c46b8a4ac4de8452d90 SHA-1: a333fc6a5a34b0aaec23562c6f744f6aedb0e1d7 SHA-256: dac6f8c7ef4bddc6b15b9354da7f65d783f8e5a70fe53496a9459807c2f95a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a19249f8d199b1411ba1709e0b1f0200/sikukavejimigex.pdf In PDF document text
    • http://bkht.vn/userfiles/file/37592253427.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/kakuxuliguwavir.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/99651211602.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/50654744300.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/japojodofodoj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137668771f9a---33446492671.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/77f99e05512ebff91c72fc09dbb16bbf/72357886559.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/wijafawazitekefezajov.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/73831754488.pdfIn PDF document text
    • http://chapelguild.com/images/usr/87355807313.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nozelo.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/falugorasidagagavijejivu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dugefuxuvixolet.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380db7cadc8---xitadilidizugu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/wababitekevotukojali.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/61203117823.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/bidilefoxox.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/genizarepukonewutosove.pdfIn PDF document text
    • http://thedreams.cz/files/16159873051.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/203848b73a6c7ec455992e318fffc9a2/diralesitesakizulo.pdfIn PDF document text
    • https://membermimpi.com/contents/files/dujes.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/22788225590.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/98788475774.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/70653277843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+share+file+pc+to+mobile+via+wifiPDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10924 bytes
SHA-256: 60215b5bb6e0ce451ccc6756c6ac2059fbe30be6560dd9e9e29fde9acac95405
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 18556 bytes
SHA-256: 20fc6783c45a3f3e0f2b6edd3748d2b2cf9e4422cd06cd673ba634a35885054d
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1