Malicious PDF — malware analysis report

Static analysis result for SHA-256 996f1bf434101df6…

MALICIOUS

PDF

88.9 KB Created: 2021-07-04 08:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3750717a804123bc71024d31c041b98 SHA-1: 3964eb77a8a7d22f9c54206a9fe3f0c1d7fa23e8 SHA-256: 996f1bf434101df6f13c2c0049aabcd63a0887fac671dc9eec05b86334e1b451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=computer+olympiad+2020 PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbe1b43964---53634644679.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/lejatasili.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2a330d06d977330f6e0bb0eb3fc63da8/lutedidetagufuwiziletij.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d9774cd0afa74d1c20e6722fe2bcaf0/lamijenoketufad.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/20973660322.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f352ea39b8---tavajuzudifuramupek.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/dujawobuwebo.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/50852954323.pdfIn PDF document text
    • http://recrute.fr/files/files/mejadakepaxegivagabe.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/63327157655.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5e5cf4348264cde83d30cbc77dab2e68/xupusabikiboloxolejina.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/wipitaniladegegasibuzuguk.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/58188709391.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/94f215dd5f7bc969685878d8a770cbac/99934262199.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/xikado.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/merolevovubim.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860532ebaff---79901107874.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e416dce06598e3ce8ad7bf7607df2f86/10879092178.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wijopitokuwu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fsm7r5ervjaff80rou6bh0055o/24516720896.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/80274647305.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/juzin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16624 bytes
SHA-256: 97876457cf7cebd64d8b06405a46b6edbae8f2930e14ca15c7ae57c42c561ae1
font_01_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4E 10768 bytes
SHA-256: 38b66a3e7b3882cb299cd1187577dd806eb262ef968f599784e95d07eb4d64f4

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