Malicious PDF — malware analysis report

Static analysis result for SHA-256 910f428eaaebd34c…

MALICIOUS

PDF

79.9 KB Created: 2021-08-04 21:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab079793a16992f85f9db52308ce575a SHA-1: 82b061ee27442fcd1652b731c77de5bd7c080e39 SHA-256: 910f428eaaebd34c231b8ad1c02cfb1ad738de41f8ddd04e1ebf085541f227b4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://byty-pardubice.eu/UserFiles/File/segul.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675ffc6622---fanafafomuzig.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9p40i4uonqsfqrshhqrmmrdbb0/zegudabamevulul.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3670365426ad1fa08c4fda2c65b2c963/60556778322.pdf
    • http://www.majbrno.cz/uploads/files/pafej.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d611495f039---72950778649.pdf
    • http://ceresasrl.it/userfiles/files/rebimosove.pdf
    • http://italianopizzeria-pg.com/uploads/files/fexosalopofuw.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d321ba13035---dubisawita.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f24bumbkca26bqk502mqt46u2g/vifejifuxipijox.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91daa797f---22508877080.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0755266348---56474302841.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/63733930999.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b323f6cf503---guvako.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c2324b819cc3973903f0364a9d5ae616/52329114465.pdf
    • https://stancijanegrin.com/UserFiles/files/96368531794.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b876d447f---dadafav.pdf
    • http://brandnewgoods.net/userfiles/file/97590168283.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6da76920b---baxemulipoliletu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5d90e0244---36322681372.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ed860829---67196737701.pdf
    • http://fipjp.com/userfiles/file/86371724808.pdf
    • http://htwy.com/upload/file/rowabotagazijexixa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=problemas+resueltos+de+mec%C3%A1nica+de+fluidos+schaum+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_off0000d06a.bin
4870530253c0ee11875a272aee17819f2267b924911d429e4515ab090ba8058d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 11304 bytes
font_01_sfnt_off0000ea25.bin
1d902a5dd921088c68faaec358b8a9e3eb9e322792630fa4a7b4b48ef835a1a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 17724 bytes
font_02_sfnt_off0001168b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 16792 bytes