Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d1bb6ce3d06cef…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 17:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f83a8bbe0db4738cfb9206bdf7051ee SHA-1: 0a39956407aaa95339484fdf4f666404c663135d SHA-256: 32d1bb6ce3d06cef915bf944c51f4abcd21133e711f1134ef418298533449795
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://life-homeshop.com/asset/uploads/files/ledijogajirojeliwofixa.pdf
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nevojesek.pdf
    • http://nebovsem.ru/app/webroot/files/files/84500718163.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130329c6ac1f---33154538450.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/povumajojomexederaxulaj.pdf
    • http://julianina.dk/upload/file/17100266998.pdf
    • http://csc-028.com/userfiles/file/20210905132152_pkkzs8.pdf
    • https://resttour.com/images/userfiles/files/rejofizujebolilijijusunot.pdf
    • http://yasairamenbar.com/uploads/files/23655568347.pdf
    • https://noithatkuongthinh.com/uploads/files/fozuwufupuvuri.pdf
    • https://xehowo24h.com/images/ckeditor/files/pufuvesulura.pdf
    • http://vertracapital.com/uploads/files/wazudukawolujewilobuw.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/romitiw.pdf
    • https://barcelona-health.com/files/galeria/files/zavoteboxe.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0559997a---26519295602.pdf
    • http://qianxish.com/ckfind_image/files/vexudagovepapenesoruz.pdf
    • http://musicincw.com/fckeditor/userfiles/image/zewuwifomiwaforutawatilu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e9a30f99476e2ffbc3efd0b5f0858314/xubotodubunurodepime.pdf
    • http://adaviestransportltd.com/userfiles/file/9685918685.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/dedokolobibuxuwuxunitak.pdf
    • http://lifeline-sports.com/files/file/11546470561.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/37092466205.pdf
    • http://xinshifm.com/userfiles/file/pokire.pdf
    • https://rijst.nu/userfiles/file/xozugavenomumumivimi.pdf
    • http://trust-law-firm.com/userfiles/file/20210906030257_638255948.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=plinth+to+paramount+pdf+in+english
    • 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_off0000d3f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
font_01_sfnt_off0000ec0c.bin
5b6fa2954f02dbf502e2903f58a790effc9a4925cdf69909efb789a195d30cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 11044 bytes
font_02_sfnt_off0001054d.bin
7c1def36cce1baa12c15f3dad82ab1eff5a92575a2331bd3d9610abd97a9ce56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 20704 bytes