Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfe6b6bce00e45e…

MALICIOUS

PDF

80.8 KB Created: 2021-07-26 10:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e987e0de7f8ef3b93286aa20ab8747c SHA-1: 84fcedbb60a29fc4a4320b7c2d36a1ec70e1ff8d SHA-256: 4cfe6b6bce00e45ea56e4fe538023bfd2afac224f6aa058987de14b3c4611ff4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a4da16c28a6c39025b3aacfdc4f6ca12/492517312.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c975b327b0b6212a87d4f66aa510266f/wuwemuguwumuwogita.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6cqcdbc0fr1tt7r6pp6c8ic245/mamadido.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609715da813ab---faferawigurinawajosobomem.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bvebn9fe1svbm2rnu7ls95akl3/3727356698.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/49537505531.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/96373865546.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xejulafibitej.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/66588940861.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/maporoladodet.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lif9vf19sa6esfnu5pf0ruhr9l/soxamoponuwalivubopuk.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e4e72a5931124d2937d8a7d4f15034dd/bumabol.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62586198410.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/romevuwazubojipafabita.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vegafevuterumutopa.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/4400992741.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fca41387---bekubimosabofezitipa.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/towaxotuwukevu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/11704879486.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/62571147153.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/pawekodofolewodekozuzi.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/zobisetotewijepok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=possessive+pronouns+worksheet+4th+grade+with+answersPDF 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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 11048 bytes
SHA-256: b84a91c4f0fccfa191ad193e0bae7221550b58245f18470f0ada1455a115f3c6
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16764 bytes
SHA-256: 18789daea03b7ff6715e84f95b2dd5eb0c3feae03fa4594ed7983ea18dbc2b4c

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