Malicious PDF — malware analysis report

Static analysis result for SHA-256 79933e325ccfa91e…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 21:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba50bec85754a68ac9b92471e97b2f07 SHA-1: 6dbe95fd37aa0c96db2a72b1de35384a51a073d4 SHA-256: 79933e325ccfa91e5496663a0294e1eec9a1d87f4da0936b10ef393950a2aff9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, coupled with the URI structure, indicates an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=crash+bandicoot+android+app
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3bade12138d379a08effab6270eef861/80473212323.pdf
    • http://polenes.cl/userfiles/file/taguxakowegupimelu.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cf9a62fe---65397908492.pdf
    • http://homearcky.nl/userfiles/file/53658965597.pdf
    • http://dsagco.com/Upload/file/20411878828.pdf
    • http://suankaew.net/upload/userfile/files/80733611982.pdf
    • http://nuitsdartistes.eu/images/file/80484026465.pdf
    • https://swalaya.in/userfiles/file/befabufovamatefud.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5nq0ak26e7m7aq3bbnj9s5d0e7/33033809988.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090c85b3d7f3---48403709238.pdf
    • http://msiutilities.biz/documents/5232673456.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/47630598928.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf00d1873---32870114470.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4jlhtn748lm2dvva41pjl1g0m5/tosanedifurekaxafesixi.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/efab84aaa701ca6e8069145f7fad7b93/14265098055.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f11921054---pewet.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64aa1c800---depemikev.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/32449653179.pdf
    • http://traviet36.com/upload/files/tufozo.pdf
    • http://sellmysayarah.com/userfiles/files/zakamaviwukiw.pdf
    • http://bajcsidavidfoto.com/_user/file/88426103807.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/rotamigopipogeb.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4a7f72bb82437e945aa28ebea47c4a2b/80538515434.pdf
    • http://fonnepal.org/userfiles/file/nosafusanipululomipob.pdf
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/13759390789.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_off0000d6c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
font_01_sfnt_off0000eed7.bin
98026bb05899903f7c0af9693fa397609dc5b7afb72e7ea6f3a85dff7a215698
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17784 bytes
font_02_sfnt_off00011bcc.bin
9bebdefcaeeb82df73463ba02040366d6555787c4c850fe51247e1ca2c34f46e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 10604 bytes