Malicious PDF — malware analysis report

Static analysis result for SHA-256 35efdbdb5d36ab48…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 17:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebee9e9f766ad945f2811dc9b3cba1c2 SHA-1: 1117c4f28c0354c02e0ad79e16812dc639fb09a0 SHA-256: 35efdbdb5d36ab481a851b08f2203055f1ea796fa9e1bcd1f94618696dd750db
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.nachtruhe.info/up/files/bukedaresufedunab.pdf In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/visur.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zozaguxevonamavukupe.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/86999289770.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/67902126166.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/6250868060.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89770621091.pdfIn PDF document text
    • http://change4best.ru/upload/file/47293815442.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/81775701721.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/wozevakiv.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/vopipuvetakifubavi.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kefoxibebuzenekugem.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/ladijuzarok.pdfIn PDF document text
    • https://superpart.com/files/bebonumokebowol.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/jukubodenevujetonu.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/66679483808.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/dosokotezukuwaxiza.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64515241669.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44dp77igrg27a4imjvgd6v5157/99235470609.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ac718e41c5f596ae1a243bdc8038503e/37697789840.pdfIn PDF document text
    • http://hanauhrova.cz/files/vulibafajenezoxoguloninal.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161328404af117---60049723243.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/xesebolalex.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27204987319.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/baximexanepuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apps+for+video+editing+for+androidPDF 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_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 10676 bytes
SHA-256: 12fe0da3719c3e088c829202246228d3368cf47c09d1c14b0978f879f6b42698
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 17024 bytes
SHA-256: 0f62eb105d2931cd04cab0b8993cbbd0e2357e1671433083d735402a1ac42f8e
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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