Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5ceab75b199500…

MALICIOUS

PDF

89.6 KB Created: 2021-08-18 10:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e8f2441e864351a6a51ed387d469c72f SHA-1: 252bce63a408849ac01e483e5ecf156191e01514 SHA-256: ca5ceab75b1995009a0178ec74bbf796367898fe8d632dec24f4c36d04e02573
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=diccionario+biblico+griego+espa%C3%B1ol+gratis+para+descargar PDF link annotation
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/94902106284.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee2b809e6---61465063418.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/galeb.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/soxamifolaxenaxotuk.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f09bf5c499209f30b504e713715843b4/didevojotexazuzejemojozo.pdfIn PDF document text
    • http://uchid.com/uploads/file/dutobisefutifuvevob.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e877b33f7418c6e29a961e49fd2030a/kupuzekox.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183cbdceb1---zakudokelipumirari.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/sofusaputofimoguga.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/zipipijujijojapa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7ba2402e---44688513138.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fipisa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b95a83c9628a9b9e860467d5efdb8c3f/jevukatojod.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe476251d17---tanitifelosezopopalupuvow.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kiximazofimapupodamule.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611591298f7d3---65746970690.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/1702222622.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d843ce7d37---72817244844.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a98feb1387dc2d4d8f03403945ce2b00/79497505094.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/fawetipojelowox.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/60015861591.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/xavudubazexezotamadu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0d169d9b770e805a09de2292302ef47a/26407623954.pdfIn PDF document text
    • 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 18224 bytes
SHA-256: ff1ed7bf1a35bb7fd12f4b92270b4467f1697491e23184b1d3cfa4b195ae62a9
font_01_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 11036 bytes
SHA-256: cd3533a932695c8067125c96cd0ea23ccf54432c4193103cee3b91b1a06e4f65

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