Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc90df86dcf5c7c…

MALICIOUS

PDF

117.0 KB Created: 2021-06-28 03:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3cbeb5075e208abb33d843640eb939d2 SHA-1: be3ebb9d94fcc3fe79f8e3322950df004f1f05d1 SHA-256: 2fc90df86dcf5c7c1fcc28f0159964a6a78a4a32dd0432077411905ab93ff247
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous URLs, many hosted on compromised sites, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03a3638d8---tifogakegazanokagox.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lpp3ijj3kfd7euke7i375qo42c/jiruluxemotazobavala.pdfIn PDF document text
    • https://hoalavender.net/upload/files/5757421896.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608787de539c5---vugebadixume.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zekomiri.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/lulidutoworikunudixomo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/31135267246.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/98281392046.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/99716595507.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h89hduba1rs7am56om287n4695/xodunutikapod.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f3926e6753afcb94b707bf1b1ea49f38/7204974606.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/r3a5fngrioglurtseljb5icruj/50060581117.pdfIn PDF document text
    • http://agama-rc.com/upload/files/toximojolunota.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/pusolisukazimitifep.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160986bf57010e---gonikatetisusipubaposi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g5hc1henfok58d2jb7ig6qo3o5/junatina.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1dc75572---41266160697.pdfIn PDF document text
    • http://siembra.me/uploads/files/bazanutifemodowukipoja.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9ef611997cb0ecdf80cbdbe8b19e3691/41797287726.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b42707660d9---vapazegokupasilin.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f81c840be---12943865126.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/662055a8f5565c0a2197f95e4bf1b0c4/vudabexejijixuwovobisumub.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/muzuvoligakav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=people+born+on+march+17PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F2 3632 bytes
SHA-256: eddcc26b3ebf8b7a1a12e7c8e72688f853a96bfb1dcf00a27d5de431432df70f
font_01_sfnt_off00016314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B2B 10524 bytes
SHA-256: 6922869b4ad1702dcbed5f5677ba31f397f8786ece9232f1afa46fe0014dea35
font_03_sfnt_off000192c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C6 21104 bytes
SHA-256: 27890f599e8c8724e64b025c2ab0f0a0a3311d4031d48ce8c69205a409776438

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