Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21fdc464bdf1be8…

MALICIOUS

PDF

95.3 KB Created: 2021-07-22 02:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72f8b25ab5f5beb46a62e9dfa0f87c1f SHA-1: 3cc85f66fcd0e2bba8e628ed0f6682acc4ac3091 SHA-256: e21fdc464bdf1be82ce43024aaf9db9926bd217426f019d285c9775a49611bc9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://kuepancong.com/contents//files/56723614958.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2qafodslj8bm72570p1n95n15r/wetupakaxusupomulebibuti.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/45613766942.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/49360047382.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/xorujuxonixe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0709741160---90571317233.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e17503692c26e87296e23ced69b00fab/63361386313.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a7cd17e8---gemivovabujaxaterila.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6c70876a---31308185856.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/20245690731.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2ad50f94bd270af806e4aafc3c5fb33d/kejilebitapazuwikow.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///79005388952.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c055e3c7---motuvudulatogebitadopiwav.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf95d4c2ea---14735698636.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a782c22a6a6b0ea9e499a12d947fd3d3/2351998014.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/16837288228.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/kivepapugumafuzunopogekek.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/76225974710.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/mowapoworogosajoge.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aec4069e73c63243fb57205d6733f416/rikoxusitozipujejiwe.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nedilavuf.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/399d9eb84b266f905883dbfb25a2a12f/48236136228.pdfIn PDF document text
    • https://mfdesign.hu/files/file/25135100477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=consolability+medical+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 2256 bytes
SHA-256: c4248117d2f758d945d18450620b3599704a93cbbf463afd289330e74c84ab4d
font_02_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 19060 bytes
SHA-256: f939529a7d1384028f7d4898c699d1a25b04fe04285de242b56061951e014fc2
font_03_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16708 bytes
SHA-256: 7e3c96f2d478b532a614b57a341bf6aff1ee9fc51864e5a00356b336241ac5e5
font_04_sfnt_off0001555c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555C 10896 bytes
SHA-256: ca72317a54ca7838b4ae16c93fa488b75eff3ec6822474506cf5e466e45ae0a1

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