Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dffd834303dd2e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 220f48c7ea0c8d5697f1c97be6287463 SHA-1: dedb3661da60b707b6786df6feb32c50ad0eac24 SHA-256: 63dffd834303dd2e28b0ab00677e73b0b7d3db2ab0d849e86d8b8407ba93a274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=dua+for+protection+of+diseases
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3556da19c9---vukotegimufamogolara.pdf
    • http://thepokewave.com/uploads/files/gewulepe.pdf
    • http://nicolalazzarotto.com/userfiles/files/lezarujakuxadepuwumi.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nanav.pdf
    • http://timesofbangla.com/uploads/files/22026171085.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf8b0be45---22794496739.pdf
    • https://onlinendttraining.com/files/xipatipuwopa.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/14f703c4e92884beba5e3e8d12b4284a/bixaxerejilaweratagesoxel.pdf
    • http://scro.ru/pic/file/kenalelofumenuf.pdf
    • https://gulf-rope.com/images/bulk_images/files/6503098135.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e82857eaa2f8085e897c540be4d9d9f5/77531712790.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199bac752a6---lixiwekaseduxoker.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/50730010625.pdf
    • https://weilaimachinery.com/userfiles/files/94527687847.pdf
    • http://ros-grad.ru/fck_editor_files/files/tonalanogafigirajuwora.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/mefuzudebowovowakopat.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/73747e85812255ea07fdc980bb4f4bcf/21993880032.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8a36c0bc---miporug.pdf
    • http://mdsalon.ru/img/lib/file/55819541528.pdf
    • http://lubrifianti-auto.ro/files/file/31668002490.pdf
    • http://agt.es/files/galeria2/files/bulelirotofodulirijadojo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5bf3908b1adfb86c1e516f71d6c12526/sodaxos.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/gujipawogur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 16792 bytes
font_01_sfnt_off0000e3ee.bin
b2228222df1f1d2cfad8821741fafc9ebdbd2638b81cee945b65804f37af6245
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 21544 bytes
font_02_sfnt_off00011b92.bin
1e265d9e1a6b2b7c4785fa73ef90b6cfa418d968f83f8c1e1bb3fd8814337e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 10668 bytes