Malicious PDF — malware analysis report

Static analysis result for SHA-256 070c6b3371f22f3d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77be57a3f8226aa6235e6819bc1d05ea SHA-1: cafa55a82e3039ad6c21bfa0db8aec4e9fec364a SHA-256: 070c6b3371f22f3d7beded8c0dd480688fb9bd853e3a3668fac66b15c64233fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories and disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential malicious scripting capabilities. The ClamAV detection and ML classifier further support its malicious nature, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.adom.biz.pl/ckfinder/userfiles/files/69086083758.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ce8f2caa54248b696070ef1c3870e47f/88557574696.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc3d8a1d---diwomomupijiroduwikukom.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/54020b540a87ed4c2f38860c1ef5d14c/wijijigukalerogusegeni.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b5e1a3c7b4234fc2fe43b7769777f5b4/83795626319.pdf
    • http://ducthanggroup.com/webroot/img/files/73226807672.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9ce51d55a1c67bbcb3aa55083664ceff/sejokipudatobaxage.pdf
    • http://agnieszkapawlik.com/userfiles/file/36131581224.pdf
    • http://turagent007.ru/userfiles/file/40311560125.pdf
    • http://nextgt.eu/uploads/file/warasufagozufaxodeduv.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bc4512c578dddce434d45d9030d6b075/40402465860.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c82af5cf---73530831579.pdf
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/vomigobujutowikulol.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d49b80683b4ddc0e8043d9f4a699dc5/48603868103.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf62a7a5e---7130683903.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9935d977bf10da5ac2c52d0de0bb50a4/nenimerajetisaviwamuk.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/17393817976.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e35fe02c1f0b87aff162ef99a69613d0/5659288065.pdf
    • https://mandarinusa.com/userfiles/file/1627652547.pdf
    • http://itkaufmann.com/images/fckimages/file/todesuninefej.pdf
    • http://ytbozhuo.com/upload/file/270544555395.pdf
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/961051876.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8f555fdf5b0b02584ee1e6afe7d13dcd/22416880997.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=milwaukee+tool+heated+jacket+instructions
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/29c7bd736a95c86d94f7dcb0277020bf/fuwusuvuruveji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fd.bin
efbfb7e798c17f2970f8eeae55b1d238faa204df895f5949d4277abc9cb28415
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16684 bytes
font_01_sfnt_off00011c58.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 1732 bytes
font_02_sfnt_off0001248c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
font_03_sfnt_off00013ca3.bin
469039e6918ede3d06016bd10eee94a1ac5a053ad2d6db76b36176757f8cc82e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 10868 bytes