Malicious PDF — malware analysis report

Static analysis result for SHA-256 572ed6d732c2906d…

MALICIOUS

PDF

80.4 KB Created: 2021-06-30 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adefdfb93f69c8e8b94c867e141ac294 SHA-1: b113448a01431ba2bf893ef35961c0a2300bce77 SHA-256: 572ed6d732c2906d073df0e0063eec782e6ebf8424bfef610804396b91de87ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://teacherandtraining.com/coj_u/KK/userfiles/files/sufepale.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/57113992009.pdf
    • http://bvsaigonbinhduong.com/uploads/files/74222408864.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ed647639fc026a774bba0c9d87bdf2ad/28969953020.pdf
    • http://yoron.net/up/files/79164640752.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc68f0bed---bivaretipuvex.pdf
    • http://apvn.info/userfiles/file/57057182899.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/betedem.pdf
    • http://activesolutionelectric.com/images/file/97741528222.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ihouhet9n869clj2lark3tico7/46491057435.pdf
    • https://xenang-mitsubishi.com/fckupload/file/fovudabimegafu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d040921c340a1f13a1372ff28c88eae0/sigafasotija.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fdcd26116cc56bd36e7d6893250bff5b/18344195667.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1015dde9---3240133352.pdf
    • http://ahsaipu.com/v15/Upload/file/202152118563959.pdf
    • http://augustaelectricalwork.com/editorData/file/tabekejadobase.pdf
    • https://betalinktech.com/blmedia/file/givikebori.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5876c8fd---zokinogonejo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608768ef2d0cc---zuxivawomajonulalipaseb.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/060e246e7c450671d4b156f3801c798b/guzego.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9n19qbbuknrbmokrls4m0360mk/49137189761.pdf
    • https://piuspvc.it/userfiles/file/5690186262.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dr+phil+family+first+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_off0000d6bd.bin
740caeb6ac6faf305b317962a292545777428418798ddd0074d26f4c6fde8a08
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 17340 bytes
font_01_sfnt_off00010465.bin
b4e654efab1315ab74ad386a243f98631b1184f128ed2900a12893cca8cd7835
pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 10520 bytes
font_02_sfnt_off00011c51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes