Malicious PDF — malware analysis report

Static analysis result for SHA-256 556392f7740b40d2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 20:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7985e212fce6f54eefc241cf64da16d1 SHA-1: ee0c36ba36cb2eae5e99d5e323dcdccbf58177a1 SHA-256: 556392f7740b40d2b2eecef2207063c270b391ec66cb1f05cca82758e93fd22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.comperat-89.fr/ckfinder/userfiles/files/woleruzope.pdf In PDF document text
    • http://aktifithalat.com/resimlerfiles/kitituv.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36778005586.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xevixivumikosanebon.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/46729939146.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/pigedavarazajulixadufuxes.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c11a3e77---jidabixegibano.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/30474632529.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/bapofaj.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/11756573899.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/660cd778d0a15258a5192e253dd64e70/42949697731.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75912824354.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a010eb6b751---kekezabarabonujonapa.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/2815929943.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/28648619818.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7dr1u72dj11pglmsjsttav41v3/19194714413.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ee4fdd67c00194182cbb0d4519c2f55a/19503891011.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/vikivi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac102150ab.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab3a8ec65d---silagar.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/beba350dc07b3e0ad39ea9c0313f4262/musodaxud.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/39626447790.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c0b8bd40ad24763bfb980208060122a1/92491032672.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l72nc5f9cn7v4ui6ec1kfl3uad/68647586851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ifrs+2016+pdfPDF link annotation
    • 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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 19084 bytes
SHA-256: ba51c485715b0c819e434553c998135395e71da4b1ee9f537f1836c8f5e267cf
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 10152 bytes
SHA-256: 635f1c602057ffc97151fbfba91387eec2e9734d9e77d2f931fa34fe9420d315