Malicious PDF — malware analysis report

Static analysis result for SHA-256 7647b0e6962f9997…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 23:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c214da5f21d0e466f327589457703ed0 SHA-1: 4c281e287dd753cc5d6d2a64fb9e563af1f33d30 SHA-256: 7647b0e6962f9997392d14ff8e8647b1775bc61a5473817a93977a5e89b5d27a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious redirection attempt. The file's structure and URL patterns are consistent with malware designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=minecraft+full+version+apk+home
    • http://cokhixnktientien.com/Images_upload/files/sagumetepikukeziga.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c0680a8834c9765cac1358f772e6539e/26149176311.pdf
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135507576242.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/848037994.pdf
    • http://podiummoda.ru/userfiles/file/gaxanubuwe.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/nefoximejojulobofidi.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450802a19b5---91592912367.pdf
    • http://zeci.nl/im/image/nutebibejolamomo.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/duzubunulotatuzumino.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a5332e14d68a01d75dbea41751081ff6/mirapezepagi.pdf
    • http://szerecsen.hu/editor_up/88426334705.pdf
    • http://studiocalderini.it/userfiles/files/dajipusajejonivulo.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kusenume.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ab2d55f76bdbb817079a26bf7b3e7b0b/2952961656.pdf
    • https://www.mds-horizons.com/upload/files/kivowemuza.pdf
    • http://jadeite.ru/images/file/negofofitinanisedipazonum.pdf
    • http://globomax.eu/userfiles/file/niriworedewijesixabazura.pdf
    • http://bijverhoeven.nl/uploads/files/luluxelajupumoluseb.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jogivasemawedap.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/xevoludakumikuzuj.pdf
    • http://netmode.net/app/webroot/uploads/files/tulizu.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tuxodipisoxemoponake.pdf
    • http://suchanekstomatolog.pl/files/file/nidipe.pdf
    • http://pro-group.ru/userfiles/files/29456086404.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_off0000b25b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16792 bytes
font_01_sfnt_off0000ca6d.bin
23188c7394b6d1a2bebc402c178065ebfa41e41fb249df75a166e97dcd78390e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 15420 bytes
font_02_sfnt_off0000f183.bin
d4b0d48bd0c7c54924e7d25710947bd22855bf0a56def167b94ca8a537f7bc4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10996 bytes