Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b0910167d3507e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 14:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f99b8ef5aa99895a55f1517b03c2c99 SHA-1: c36806ac5824674ccc5c8e78d17ec7cff450d9a3 SHA-256: 88b0910167d3507ecb9244d3078265e3d829e895c0a5f4121382a936d2e663f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure victims. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a phishing or malware-hosting site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fake+itunes+gift+card+code+generator PDF link annotation
    • http://rayer.cn/d/files/muvapumobemulop.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zapizunagavuruf.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qavkbfgv9do4balllbumtasvup/69095389371.pdfIn PDF document text
    • http://hotechike.com/files/files/somalososabisevawilupike.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_133BDB3E609AE544.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd219d5ce---getafa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01da53d9e---36737622487.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/18584422384.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/75914964259.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5fd971c5---mowagaxalapudar.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/58109155705.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42629219337.pdfIn PDF document text
    • http://skupka23.ru/upload/m/23886430479.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/50244399228.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329da42117b---dusuvedadazukusok.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/65463315641.pdfIn PDF document text
    • https://pindimana.in/uploads/file/29140552520.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lororefelugame.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/posoxi.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/xezom.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/92607822358.pdfIn PDF document text
    • http://sayarbobinaj.com/file/zajejejuluke.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nv9qlhdtd9v6u2mcp06sfrj1r2/96654927451.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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10772 bytes
SHA-256: fc8da1409adbef6691f2ca35f326a0d5bbb1ae808477824e353683cc840ca810
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 17872 bytes
SHA-256: 875070eee3fb0fcb48596e936a3d0d9c8a36aaffeefed6b61ae0eee39e2fe531

Open this report in the interactive analyzer, or submit your own file for analysis.