Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dac755ecfc7701…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ac385b3ff4d041e0f5e178922d6814 SHA-1: ab6eb2bd14f6767940c8d1fa8829948bb376db91 SHA-256: 04dac755ecfc770112cb2e56c7c76680b825b9c983d4fe2d6e006db282a637b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4nhp7a76j8p6uf4h0viob0av8v/ganisiziwuk.pdf
    • https://intrigantka.ru/images/userfiles/file/gajavivido.pdf
    • https://aawyx.com/sites/default/imageuser/file/63817064904.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fec03c424---67004640441.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7efduc8kj6hck7lnrq7dktnj35/18808544920.pdf
    • http://austria-ex.com/images/blog//file/komebawekexifagoni.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ukkdo828j6unq28mm4o460nuct/vokurifimefi.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fe8a08b0a2173df3b6bfbdee845f08d3/ronibidanarometuwoz.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/69123120233.pdf
    • https://giriconsultancy.com/content_files/files/25899417941.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/iptpdldsv188l6hl307ug4gs89/kuvom.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/927917f3b41bda7b515ddf1de160b7bb/mumuk.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086824ae178e---28671953153.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f06f0a21bba1eaba9e9bb34c03cd16/xumipivabazaxate.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jjom50meloif4aedtl7kbcnfv0/1159676882.pdf
    • http://thaide.org/userfiles/file/jugoduriwikes.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e61306n22j0fbh396m7f3kasv1/dawimomogo.pdf
    • http://alphasigmaoverseas.com/userfiles/file/43346726266.pdf
    • https://travelworld.ro/userfiles/file/kuxoluduvebivopuwunarodak.pdf
    • http://infinivideo.hu/sites/infinivideo/files/11483403320.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f094f041---xinubomujexi.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/sawuwexomexa.pdf
    • http://uhy-th.com/image/upload/files/lufavub.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e639cc9ffa00463d5b259c8e4c01c053/54359865337.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=creating+a+data+flow+diagram
    • 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_off0000eb2f.bin
6268b4107b78af17f72e03f069d6909dc06c44caff2539a4dd632ee2e1f183a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 18412 bytes
font_01_sfnt_off00011a1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16792 bytes
font_02_sfnt_off00013232.bin
9377cb35161a886cb76e3f79b9350750b266098352078d0c32e8417073e079da
pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 10648 bytes