Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff78ee45e23b9ed…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 23:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4339eea5ad78f3cbd5bba46be9a067d8 SHA-1: ad56e2b535f7b9b5dcf58a7db7deb9ff07c7504c SHA-256: 9ff78ee45e23b9edc1f77b6ea8826efa3c94b5b5ea379dffd3e60a9be47d8f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and URL patterns align with common tactics for distributing second-stage payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=ielts+general+reading+test+2019+pdf PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865670c1c42---16718792550.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/uku8uo6pk6eiomf24gn9tdacu4/puwavewokutenawomosaso.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/17118117174.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/73279409818.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d5cb0d10df5287c3b4b54a87012b50bd/75259140771.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/736171ce4cd665bff55d14f19afb6e68/xudufixabifik.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nudod.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ef14dc41601ab0b79cc6597ab201f4e6/wulukewukizujav.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/64221664310.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31bb78e85a---98251460367.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d3750d84---paxapamoxijilipoluxen.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/73196076753.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/8121959617.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6816a8b46---930557252.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gikubupivo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lumija.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/79683256103.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3a5040cc---90159303167.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/14895843186.pdfIn PDF document text
    • https://loctra.net/userfiles/file/30553819751.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae6267366---37964983785.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75b04e6050---38422689586.pdfIn PDF document text
    • http://bio86.fr/fichiers/15675557516.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/27822387370.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/sokotaronemulasudor.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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 10964 bytes
SHA-256: 7626d7e30424bbff8220e7c4fc7c3e2967c47f25597e098dfde3c6a5c8ff8ee9
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16740 bytes
SHA-256: e006986db2dd1147adbd272d5a07d212cc5afd645dd88779d66287637e13059a
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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