Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1b9ca02319798…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 07:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76bfe24a77b9a326522371961afc1a5f SHA-1: 7bec5b9cfeb0330d6be654940c5c05cfff54d6a8 SHA-256: d3f1b9ca0231979891d5749ae990aefb581dcd2524b4b0ee17e3098957370873
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.mediagrand.hu//data/editorfile/91191369269.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4imnniqvoo9q5qjl9m4993l4dq/tazabigibaziresowurizozum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b330a9d1---rixof.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e944eded4---pibugofakutoraxavol.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/vosojixerazu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/25379252006.pdfIn PDF document text
    • https://dcimx.com/files/nuxesif.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/55365209550.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/tenemagegotokusebiwo.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zevaxuvugise.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/11588046349.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/89549307256.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/legafovixodobupepa.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e90c8dc5e35031be514654232ee20045/70111803200.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/siriled.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/85380682078.pdfIn PDF document text
    • http://fygl.net/uploads/file/101216037495.pdfIn PDF document text
    • https://mfdesign.hu/files/file/baborejubisinevikori.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/82220468027.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a060dfa5---36107039357.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/19085110753.pdfIn PDF document text
    • https://nexusmediation.nl/files/13422686507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=literal+equations+multiple+choice+pdfPDF 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_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 11088 bytes
SHA-256: 67369bd229c76163ef3f471e16972bf0a5cda201c3876a03505b984d2548f068
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 18120 bytes
SHA-256: 339232f7d06d2fe88885caf7704093be19559c0929deab1b505f89cddf0647e0
font_02_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1