Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7cff24f8348066…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89eddae29bfd6caa3bd7b28a3d7f53ba SHA-1: 794cc53e252e61f1bc30375c2362af5eba0ad476 SHA-256: 4f7cff24f8348066bcee7e58717025dccec4bf95a90dcef6f4a37ad36de3a57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://asea-admin.com/_userfiles/file/20210520091747.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/29514924254.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/264dafeafe7c0bea543def956a90e0b7/wiradikev.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • http://axwelindia.com/uploads/19458822319.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/lebopitugezetozaleruzeki.pdfIn PDF document text
    • https://fototipia.hu/files/files/24543836407.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e077525067---lupobitujiwokazonu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fd72c78d2f53e23b246a1bbe91558973/suripafupos.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/wujafusanigixojipopuwime.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a837496c0e---70352834435.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/fawelunutalow.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kesirov.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/28825801294.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070230e580ac---sonifow.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-5/20210605035441163897.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f156ca0d7f14211606c5d8eb35f14531/fimexoxixusuke.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/javesenunulosoxisinax.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/segefubezudolex.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/28872994822.pdfIn PDF document text
    • https://vzglavniki.net/data/file/2145434540.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/54525950363.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/82310490300.pdfIn PDF document text
    • https://cargobull.cz/res/file/48805563592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+rotate+pdf+and+save+using+adobe+readerPDF 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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 11008 bytes
SHA-256: d4cded9218563fd160dc7996cba92a3dd58c50804eee2718dc7a709063b86ac8
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 18500 bytes
SHA-256: cfee88cf5dbf50f5187d8d34aa6098eb5be15160306f5ff25a09e222c37c068d
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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