Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f1865247ec74a…

MALICIOUS

PDF

72.4 KB Created: 2021-07-17 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 844fda466b44fdd2e22626de05798b90 SHA-1: 5747c68a364a79d505f0a7544371b23d6e1a5c9e SHA-256: 887f1865247ec74ad68f8f48d0a85ac7b0537d021658b1719ee43a40f91555e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d107fe5d33---kijupogoxoxelemusew.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/781845287.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607df18f8690e---nidekeradajimubusejozi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/48222463971.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/2822529096.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/40629259705.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/wuxiwigokoki.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/lusuzegevezodaren.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/9519991622.pdfIn PDF document text
    • http://kco.su/userfiles/file/83847689176.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe6d3d6c1f---wubobedafubafufenota.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d063c8519---39178907524.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/roziraxarapeken.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dc87b88---meluvodobuzumejepenemo.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/77488984861.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/33597634735.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/02180cedc7fac36fcad78d4a4df5ba6f/fugopikilofekom.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/34795203140.pdfIn PDF document text
    • http://aurora-c.jp/files/files/dazuzibuditurawagixu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ijhuqth2i2e0i1nvtttgvfh311/86076315997.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/makixorubutorowodanol.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61cdf7f4cd---palobividutes.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/tuluwavaremajekonas.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/robifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jeff+beck+and+rod+stewart+people+get+readyPDF 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_off0000b791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB791 15944 bytes
SHA-256: 91f9029fcb802571cb3d52cbf7f57d466a8c6e0db9303a6f1e93b0ad4d48dcad
font_01_sfnt_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 11128 bytes
SHA-256: 2c3502f15ac3c2d39bd1972c0bda55bdd869840a28abfc43b5d31c34f512b25b