Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3765f99ca59f6a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aafa67c7ce4ca0ab1c6d7b837e447ada SHA-1: faa486a4e548ece82157a3a8732e5e3c3637cee9 SHA-256: 0c3765f99ca59f6a9a2904cd9b0020367a2c54bc5da4719bd8b06e27087cf84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. Several URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=high+cliff+state+park+map
    • https://alakharia.com/public_html/userfiles/file/64098511013.pdf
    • http://adams-gold.ru/archive/image/file/44868796834.pdf
    • https://ipic.vn/userfiles/file/94897338906.pdf
    • http://nickels.design/ckfinder/userfiles/files/regavoxuganidudutevotaz.pdf
    • http://roland-toys.eu/userfiles/file/86302202516.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16081d82940097---39258286044.pdf
    • http://flygarfield.net/userfiles/file/38521646660.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8ac6bbd29698f39fdb7d224af1dc61b9/neramakaval.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/39cccc5785ce8e70faf2861c7b3a7d7c/wuvan.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/328342af856bf804c1fabef958933158/3493927180.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/96501468508.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9f7aaef1527fb1fbf2ce6b64c6ff24cf/jijexeno.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3978c2eab7---gogokudolejuxunune.pdf
    • http://tano-cable.com/d/files/rolekepevukewakijiwiwa.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/bikagoduwabebopuweruzatu.pdf
    • https://arichaindia.com/userfiles/file/63234305701.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607be44e21fba---30497202900.pdf
    • http://7tec.ru/userfiles/files/95967881858.pdf
    • https://bushregenerators.biz/userfiles/files/27937734995.pdf
    • https://anmoul.com/userfiles/file/tidaxonuvawakabi.pdf
    • https://ahha.az/userfiles/file/30105918609.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca7139c56---wesejo.pdf
    • http://interel-rus.ru/test/sites/default/files/file/31239951324.pdf
    • http://remaining-mc.de/userfiles/file/88385629459.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc25b51ce---fexejorojezeb.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_off0000f01c.bin
0375e7992fcc106255e6d57fdf75f486e8964d09ef77e5708493a996739a20ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16552 bytes
font_01_sfnt_off00011b51.bin
c96bef9b19229927434a8d4b6b64ab8608df9c03cef8fc8826c00067542ffe0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10784 bytes
font_02_sfnt_off00013424.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16792 bytes