Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f997e1be92ab8c6…

MALICIOUS

PDF

100.8 KB Created: 2021-06-29 11:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a54ccb02f4466854a91b3d0d92952f37 SHA-1: 11eea297f38d5ee3e85bfd4cb26234db244ba723 SHA-256: 3f997e1be92ab8c6f29f0fb1c56af41a0ed2821d77f00d168fb0322e9fc6fbe6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1fb040b8---ruzilimodimab.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2ada3b5a481d6d5aa872925383ff6931/dumak.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8013e8868---76150671609.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160909279e16cb---41174549623.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc927990c2c---79194450041.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-14/20210614091427639952.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099718e5db00---sovoneletaxidogopi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/276bb21e624ec42af0d30bec503a2c20/zuserigewuxelugux.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a459ed4c671---23989703203.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zazuradak.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mawatiketikazewi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95012662c---83809028718.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/75657631599.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/duwiduzagezoriditewonate.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/da7d16d2ffd0e3bba2b0fd917a5d4ac4/54719858810.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6uiepu6d0homheegb21gqbvu8/towelemimifef.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/rewejoni.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/mirofurigujuvaka.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9903e71971---2083889595.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/xoxulilodud.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8279174e03af71fa2e00250ac88e5eeb/45570040174.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/22d566ed3dc6fc65c69f6946dd58818a/51576260895.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/61862261916.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/vuzanipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dominant+religion+in+malaysiaPDF 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_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 17004 bytes
SHA-256: 53a2ddb9c3989cd46a9eba3f61d63f0ce2dd9fb7e58a91f15f6e18500abab68b
font_01_sfnt_off000155e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E2 10564 bytes
SHA-256: 659c4d7015db1689e6a9c0867dc7bbc13794fbc72f22c0c8ef533662e705ec97
font_02_sfnt_off00016df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.