Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ddfe5fbca9fce0…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 00:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2bdf7ea4d736465db816d1578e118767 SHA-1: e9e4753194015f87e910c44f980a080af0a0069c SHA-256: 58ddfe5fbca9fce06116c7336b6a7a521f15504a331313bf7217608939b286d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a likely intent to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://eyetracking.pl/userfiles/file/nitijolizikagazoda.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdc35624f02f481489ea75d06080fdd3/40785669336.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/96196210819.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/paof4gpgboi1n67tb9oiiepel1/8624842140.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d9ae62ba4bff0c5e925e7c2357529157/domodulezajukizelebizax.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/1382394065.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6501600d---redazuluvabokug.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c097597728---pabekuzowuvewepukerobukav.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/26d7bfc5d08f92bc4d08a35d4d4aba9b/87799198074.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1jmngeaq6msjo7bgb9rdkesmv5/nasezini.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b98fc2d13---76785909017.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cc85d3aeb2dce723f1de2791f7688bdc/48358056232.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/74577832303.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/de58b9f31beda6703abe773d4af0c354/jorukosoxuxato.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2946ee7e56---zibebirobaxofugatuseru.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/fozamomisebimepiloba.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/mowipemikesafakisubip.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4926ab925003da34dd26956438e67733/lujadogipukexidekexovum.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gixogavizafijiluvesajaze.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39afaf0f9---37337693005.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/597c56b3d0df048b013be3d8e561b105/derokisudekupi.pdfIn PDF document text
    • http://0930actress.com/files/files/23517494285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=frozen+mac+and+cheese+bites+air+fryerPDF 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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 17096 bytes
SHA-256: d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 10984 bytes
SHA-256: deefa12e6bf2b597c3a0c68beab11135a09f8f63d32600afd9c2e150bc732189

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