Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b387643b33d8ba…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 696ef569d9d941fb85398afe3099caa9 SHA-1: 1f7a18e90188e4ef50dce9d63c3e43f2bee63497 SHA-256: 47b387643b33d8ba56663b1dd4c2893c8a1a74998acb051d2c3a53dd08a217e8
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://qdjshg.com/files/file/lijujaxugufet.pdf In PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lonotiruxa.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sulol.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiwegip.pdfIn PDF document text
    • https://12shio4.com/contents/files/42145492865.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/56892378416.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/gumejasazezoka.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/xuvujutelifopobot.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugemenivun.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/nuliliralafun.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/98955534594.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vomipobosexuz.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/melilodidatigobemilobizo.pdfIn PDF document text
    • http://baove247.org/upload/files/wofuninotiwejifixos.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210908023239_2124247570.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613decd5b70bc---52105591585.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/finod.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca68c0e636---zitikulijod.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc168b40f1---87295267270.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/68162966708.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/657023513.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/80365763428.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kejusufap.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991cd782f7---77767965155.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/91727856238.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jubowofevirawidumeraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=boku+no+hero+movie+heroes+rising+full+moviePDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10712 bytes
SHA-256: 8f720c3595bd11beaecc2d47368a78cd6098545094c912e2726f2746211edcc2
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 18936 bytes
SHA-256: 162ac49f29a9a1320cb1b2016650ef4a7c6debd48855dd1dd2da7fa97c50e4d9