Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a3775588b3bf79…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 12:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a775394ccbd871889189f685f12ebd44 SHA-1: 0e0a07c1ff6ad07d46c624836dd3f7e21675aa75 SHA-256: c6a3775588b3bf79d4ccca5f58f78149575ca6743ef5ce1a945af89916cb372e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised or disposable hosting, and ML classifiers identified it as malicious. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=going+from+android+to+iphone' and links to compromised CMS uploads, suggest a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=going+from+android+to+iphone
    • https://kaparatt.com/images/File/juxasiwija.pdf
    • http://mama-care.com/UserFiles/file/zujowaxixojasejafixux.pdf
    • https://radio-clipa.ro/userfiles/file/buvujakimetokenav.pdf
    • http://ros.by/ckfinder/userfiles/files/ritudapizovujupezage.pdf
    • https://mintowncoffee.net/uploads/images/files/3268012810.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/43849709828.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e8814a11e---74765152017.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16145b6b3d6411---39417991415.pdf
    • http://52963566.com/upload/file/202109020422246603.pdf
    • http://fizjoactiv.eu/Upload/file/85484905932.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/pozidu.pdf
    • http://www.szphotar.com/admin/img/files/temidixun.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d743736f8---24942692525.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161332b1a483c1---narizisagas.pdf
    • https://texigo.tw/upfile/files/2021/09/05/wasufejojodipufivotev.pdf
    • http://innovad-ltd.com/userfiles/file/12608078402.pdf
    • http://winso.tw/userfiles/file/4838220549.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/6983048780.pdf
    • http://ekmeta.lt/failai/file/sotolejegaxoxa.pdf
    • https://812423.qqtogeljackpot2.com/contents/files/wanusopefi.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/wavumolibomelopevopapu.pdf
    • http://chemicalengineers.ie/images/naditoz.pdf
    • http://kemmurad.com/webroot/img/files/jorinuneluxa.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/22176042431.pdf
    • https://signos.larrialdiak.es/files/galeria/files/74415075182.pdf
    • http://saraya-shop.ru/upload/files/75685326913.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_off0000b93c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93C 16792 bytes
font_01_sfnt_off0000d153.bin
24ee4b60e278a29ad10145764b5cafa0a7a68232d351c682360228b71102ee5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 10772 bytes
font_02_sfnt_off0000e9bb.bin
737aedd1c704db638c1e5420dd2b726b4ebfd430feafc6f767472288bdf2314a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16896 bytes