Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fe87fe2a7806ae…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 00:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4013fa46b38122787ce363eef4b4d3d1 SHA-1: c17c8e013a34e093c1d2c6ec84773a11028fbe75 SHA-256: 77fe87fe2a7806ae0542a6c7d3c3c1a51c60be12340fc1fcb97916ea9062c6fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to various websites, some of which appear to be compromised CMS upload directories. The primary function seems to be redirecting users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=overlord+light+novel+volume+14+pdf+download PDF link annotation
    • https://harrisitalia.it/uploads/file/kilirofutokobada.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130120a91d1e---gafowabev.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210908_4FD1BCFBB2A19FA8.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5ba82ae1---ramome.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rovodovanisitexolojeke.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/fotatuvuvadaba.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/noguta.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/1260863038.pdfIn PDF document text
    • http://sinostandards.net/upload/files/14925151999.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wagepefevaresitazar.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/xegikobowefoselidub.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f917b6bdf---64020115180.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/35869510685.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/69142846586.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/84464323852.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/nemasamujata.pdfPDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kvu40ft25kgtdn9jrb3qn3le8b/11797955164.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/seluwosesanotexebozisati.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/23982495990.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/59983553955.pdfIn PDF document text
    • https://kiptep.ru/file/89687284697.pdfIn PDF document text
    • http://kasargod.net/uploads/file/92474399524.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/rutowipodalibute.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wamisanirapojukiriruvin.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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 17324 bytes
SHA-256: a9ec6093b0d10ac002731840c98d24a6057e61dbcdd80c5091792f51134267c9
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 11184 bytes
SHA-256: 03ce0e13410a73284393b4dd978b71ebd5cc2e5a2a6f87b2d5cbade75498b5c2
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1