Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e59d26ed2c8ed8d…

MALICIOUS

PDF

85.2 KB Created: 2021-08-15 22:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d360d74786aa7bf6a9ed8609de02a15 SHA-1: 08bb13d3192ccc6a5e70c7a7a35b41b77e2d0855 SHA-256: 6e59d26ed2c8ed8d96b0908791370afdd49bed0daccc0e70d45eb2feb6248442
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a fake CAPTCHA or human verification prompt designed to deceive users. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or harvest credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962c156c0b7---kuriba.pdf
    • http://hanasushipickup.com/uploads/files/35337029087.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/dutalowolelolaxitosekiwo.pdf
    • http://acudrved.com/ckfinder/userfiles/files/44414414024.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/oaod5cqcoorpcv5npnv5f9ce69/90236970749.pdf
    • http://www.ecvbrass.ch/user/web/file/38175761423.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be24c20a7cf---50157541166.pdf
    • http://baaningdoi.com/file_media/file_image/file/5715155952.pdf
    • http://kwartetproforma.com/userfiles/file/labatixuwolirewusexobes.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd42b52fbb---31789593834.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rnchkt7sa4cgnd52i9q99t7nf0/kipidasanubi.pdf
    • https://bio86.net/fichiers/samazabosuxetuzu.pdf
    • http://retailcop.ca/files/gexivirufesurefifogakepem.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/worolenawobixafiv.pdf
    • https://sunnyvale.com/wysiwygfiles/file/65663045827.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ccd4c9a5417c722942d25f2d83d81509/43298506099.pdf
    • https://vivekanandbawwa.com/userfiles/file/bekematofamixe.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/junitedujisabuko.pdf
    • http://shannonlakeestates.org/fck_images/file/jagenoduwotamulas.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j5lkkkocf7o3vo59lirh6ppn43/minogujepusowalomuwasab.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703311a7d0b---sumotoxesonifax.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1573fd5ec5---wijodawopo.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/vulexa.pdf
    • http://3xlove.com/uploadfile/file/sazagokuvorawufawovit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+robux+for+free+on+pc+without+human+verification
    • 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_off0000e241.bin
d1d0eaec7e6048da29848597e98d7259be651eb1b8c5002ee1e44883082c6716
pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 11196 bytes
font_01_sfnt_off0000fc1c.bin
efad8f26433b6681dd1a9efc2af5e602bc5af877c9dd2c9dd41d958bbb17dda6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 19204 bytes
font_02_sfnt_off00012d9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 16792 bytes