Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dca959e8f40b3e4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 01:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f92aae09cb7b395eb5a8681977bc2e7 SHA-1: 474539a3f836245db7f687d7fbc0cbdff356f0b4 SHA-256: 5dca959e8f40b3e48a096427495c35e1a422ff8d787ab9427077a335edba8a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to websites hosted on compromised WordPress installations and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=excelchat+test+answers
    • https://egyptsuntours.com/userfiles/files/27115995829.pdf
    • http://haiphongcontest.com/images/files/zululigukufogipaleveza.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace632018a---monut.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b87328c48---sasezesagajorupigap.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntf1qo7l45ouh6k9q1mjpioqri/5315452255.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5f0b7db6---xepemupelorator.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lt577r5shrvh2963gjvd7vlivk/82336887658.pdf
    • http://alliusie.com/userfiles/file/27744563622.pdf
    • http://mebco.ru/images/file/tewituvawimukarisadepuvax.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0382f2d8f1---patalozezeluwamilavekivil.pdf
    • https://allcreaturesinc.com/files/files/numopumusasuxagafare.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f6df591bdb2826412f125546aa04157/83301596705.pdf
    • http://n-production.com/upload/fckeditor/file/latodekad.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/00faf1b5fc5e906a66cfa0de1d381f38/lezanakafirebofixebarogug.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/nepufabuzuvidudemazox.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3va171kbpeng5nbstc1lff95m2/8809878304.pdf
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/55844459665.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74d3175de6---72189100453.pdf
    • http://chinawin-consult.com/userfiles/lodibebipumuginupiwike.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96c91370a6---29706257148.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1cc744d66647adc63fbd2de9178c62f4/90413293460.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/n8pq5a8an6kcestk2i04jgam83/35262611613.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fab3d72c6---sixodutuguzox.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_off0000c422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16792 bytes
font_01_sfnt_off0000dc39.bin
62ca4782666ebde313d9e06da58da20e148cbf352acba732a667ab1c69c1de1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 10288 bytes
font_02_sfnt_off0000f367.bin
b1c49b99dfed8f662f34f5101fa1dbb28f96ee03e1336b1ef63063046d5ab7a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16088 bytes