Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba1b025d8ad9321…

MALICIOUS

PDF

87.9 KB Created: 2021-08-01 14:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06e04d9108c9f0fb48fbff1714d8875b SHA-1: 796412074a7ac9c2678acf787ffcc233b3eac015 SHA-256: 9ba1b025d8ad9321792c943834469d83b799e43445275b24b76b042d263e6bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=how+to+train+an+australian+shepherd+puppy
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/98c4c1cb6acfcc8e507b49b29a48119a/xeraxesezibajepipa.pdf
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/kepenamewanizuxinaliwiw.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41d9aca450---42919435760.pdf
    • http://jnnycc.org/userfiles/file/witutuxuro.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607604ad27115---84517243717.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb5486455---jadijuneletexegalesoroser.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/513375b9587ecee22f3d1b76f93c5c86/85372465119.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964be066780---59983091867.pdf
    • https://svingenieria.cl/userfiles/file/lijozewav.pdf
    • http://exdebt.bg/userfiles/file/59201950851.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/70496929086.pdf
    • http://rilta.net/userfiles/files/19135042444.pdf
    • https://ferado.vn/userfiles/file/95072220348.pdf
    • http://a-swiss.com/upload/userfiles/file/74485236343.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/97973873972.pdf
    • http://www.donboscovizag.org/images/files/15546432680.pdf
    • http://laptopcuhaiphong.vn/upload/files/lijifavigapenugit.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2909aa53---fukojizuwejasu.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0257c1a22---bogobifonuneribirow.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/r93dh46spmtdfjhp060j9imup6/rovanodowulapogit.pdf
    • http://ilkemymm.com/image/files/fimenojebonupewujomarul.pdf
    • http://andrelandberg.com/userfiles/file/21921763390.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/436kmpsgum4kqdnihje21k6c40/vukipejomipafazomosetafos.pdf
    • http://capmar.eu/userfiles/file/zurosefuperimoxi.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_off0000f690.bin
2266be29b967da93ed11086c9296e468627f3a56ca62fb0fe8f01823863a7341
pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16468 bytes
font_01_sfnt_off000120e0.bin
bcd1eba34067470a4cbd85690547ae6790c4c69697c779d56edebca5ee2726e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 10780 bytes
font_02_sfnt_off000139a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 16792 bytes