Malicious PDF — malware analysis report

Static analysis result for SHA-256 1053e2c053c2d1d5…

MALICIOUS

PDF

83.5 KB Created: 2021-07-03 03:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 913d0e3117c9ef7106724db40bbc9f4d SHA-1: e596279164c1ba4bb8cf19c258a654a4649b8afe SHA-256: 1053e2c053c2d1d5f296750b6dac6c0a071c2728bb84313486629cf43b088e2f
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's purpose is to distribute links across potentially disposable hosting. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/360c23ff7318f533dcfa79debd396271/mikaxutuwopozivururovi.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7d96f4df---88740286761.pdf
    • http://ipost.mn/ckfinder/userfiles/files/24367578263.pdf
    • https://unique-u.biz/images/uploads/file/falewoxe.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/42274690495.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979884117c---zopovabuleromimunum.pdf
    • http://www.derbysignandgraphics.com/uploads/file/77612217510.pdf
    • https://slide-bearing.com/d/files/94635933179.pdf
    • http://cichanski.com/Upload/file/24687159451.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dq2flp3pmti52kna0d31l6b3am/63497223976.pdf
    • http://bjbtrh.com/files/pic/file/71466255573.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u98f8psd53p5vc370g6078n0k4/58914426228.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/jajexobezowufojudosix.pdf
    • https://alutat.com/data/file/rupifo.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3bftge3k0vm9823h45nbbqehko/zobudavu.pdf
    • http://bajajsports.com/userfiles/file/75922834072.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d71f15a7a---82320543650.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8064f8db2d---44783692261.pdf
    • http://komputerzagrosze.pl/userfiles/file/33151207564.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=baby+red+macaw
    • 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_off0000e428.bin
26544d6e517eb2b4be5f17efb877ed714b305be46e6093bf608a954c6ada0925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17592 bytes
font_01_sfnt_off00011237.bin
a903093f9a2cc22eb5857de118509ed1eb47f2550f3f92842ae2c75418857fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 10296 bytes
font_02_sfnt_off00012984.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 16792 bytes

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