Malicious PDF — malware analysis report

Static analysis result for SHA-256 c661c83e059b211f…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 00:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cf99031eb4dfed86dda8acef77326a SHA-1: 51b22413c7faba11f8cf9a77af5f8bfa17f22c7f SHA-256: c661c83e059b211f05194dcd4ed916fa639437482bb0c0377c7c4d9229195482
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://inwebjor.ru/uplcv?utm_term=learn+php+pdf
    • https://alakharia.com/public_html/userfiles/file/dufafogi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160823a1323f6c---34921919649.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/falopefirovixeditujilox.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072dea6ede58---12793410154.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/27946495888.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e6582f6---24336662465.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6726268a11---71214057012.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb3a96e198---xupubiminalojizanep.pdf
    • https://foundryindia.org/userfiles/file/59429348481.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160860d9357622---85612330042.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160871d695e14f---fodimokigubapakogazubunom.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210530015540.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb69fdc47d---poradasonid.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160855da200ada---dugotuzawosepixisovut.pdf
    • https://webmenuplus.com/images/file/84270211757.pdf
    • http://ohappy.org/userData/board/file/tibegozigojuva.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e5b8d09678f7141c72a516fc67d827d0/dogutamevepirepisesaxem.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfcd4339a---nuzexirepox.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2f38d4ba---fudepurinisu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66be765e3---mirepuxigewogulusekejamag.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021691747244884.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1p6j2kio9cudhbrqkhoijaf1jq/jabumu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609987ab278fd---72118913246.pdf
    • http://ingmontagna.com/userfiles/files/92694889509.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_off00011898.bin
fd1174275858652afed221508334c9573363f5ce339f8da3c607a34a563acd49
pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 10028 bytes
font_01_sfnt_off00012eab.bin
0b8f188f090abb028e305c25caa8c403a8b4620ef7d81ff7c47bf9e9b9f1e3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 17836 bytes
font_02_sfnt_off00015d86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D86 16792 bytes