Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a333a4a4857d6c…

MALICIOUS

PDF

96.5 KB Created: 2021-06-25 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bf4aee65e0190e116c66c3026832bbb SHA-1: 5ed33722d251b4e5d4373363edf2292023157e65 SHA-256: 77a333a4a4857d6c74cf4e7e7cd95d104bbe2026bb714bd87c7d52c1cff412e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://unnatiwelfareorganization.com/ckfinder/userfiles/files/48852393776.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/20339922995.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d9ace5e4---demubawa.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/226fc6d9dce797a276f993032fd6c440/91611543983.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074ab9dd30---5914062644.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570072b691---rufibofafuverap.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xezokojulowanowuzabeket.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wuludawajokugedera.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2n90iom5vlqdb3fgdcft72fdii/lokinikolapesofokiwokil.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/laluxifipubuniwaselebugap.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a52bb3fae---462296628.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/suvij.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/99649467868.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078373a26ee8---nokanin.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rezepofaxa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d86830f54---55689182634.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/96c2cba4ee90470feecff70ae94d1d51/fanubolarowewase.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0958680e2d006a0f6101734becc17470/zekezuvajizufanutegosov.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/da7niapvk3g1me4707kee5o5ud/xenesuzufip.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/17447386258.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c4f7d517---57615898254.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/582810137c598d64705e536d10500d13/62324775965.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f1ba05c---motev.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160958e64a3945---gagerijuboxumemematuk.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/498ec36d69f611bb8ef39ef8aec8e11c/latewebizovugubagufitegot.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/41452618140.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fd5db621a270177ea74ef4e564f558d8/77843515151.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h68sq5nbfg6ce5oj03qi0sstj7/60802357937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quotes+for+hair+colorPDF 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_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 17196 bytes
SHA-256: 415ca494da5ce392597c328a73c224075aa7f569f381656ca3a9e3a2447fc329
font_01_sfnt_off00014457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14457 10488 bytes
SHA-256: 15bfb6eb148399a096eb413e87fd6fdfc299443b96b967eef6b72250ffec17a6
font_02_sfnt_off00015c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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