Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06cd845079efba8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-22 09:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48bbe96af8f065bc3c0f30abb371c72a SHA-1: 58d17339919b96254e3ab5f3dc22eaf780732575 SHA-256: a06cd845079efba8469cc90a160a70f16291e98bcff668e1fcc579afa3bae027
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload via the embedded JavaScript and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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 http://allier.proximeo.com/ckfinder/userfiles/files/20850740918.pdf In PDF document text
    • http://ridendo.cz/files/file/kitumoxobojuzeb.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/41574601842.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/114f9ae9d58ebcfb9593f3716d4b16c3/zidefinatadowozonunatitip.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/169160280.pdfIn PDF document text
    • https://avela.md/userfiles/file/nimojozajuvowowo.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/zixusujezusamemeve.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67935408290.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/rorelijuwipegekililupek.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091518352668.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vivonomamakefalajo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/drke1f2dj0g5bc61c0gbqqmeq3/jadakifu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f0c182ab9---77648335427.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/konuwibiwad.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/35034543386.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/12077818249.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/473f792cd7f645f3d1065b7f62f8f759/nozazora.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/88154839750.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210915201248.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4133928295.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/45361183059.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/8845246458.pdfIn PDF document text
    • http://huefpdf.org/upload/file/17690259172.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cc5ef9aaee2487a4e23856267d6d51a9/50846925620.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/55749297122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=classic+arcade+games+for+android+free+downloadPDF 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_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 17024 bytes
SHA-256: fde1edb6b41f3e563c708d3f99b59aa552b446d4701a5114274e359663276d16
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 10836 bytes
SHA-256: 631dec8838793a6e943669298dc4fba0b4a6afd86fe56ace286d40c029c67d33

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