Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86cce007c7e13a9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35c52d20424d147c5d618d9ef0428b4 SHA-1: 90548da5290885094716c330074a85796baa831e SHA-256: f86cce007c7e13a939452b3f9af322a27ccfa29433d4b67868262eb9d35bac1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://pistant.ru/uplcv?utm_term=good+knowledge+synonyms+for+resume
    • http://indago-rovigo.it/userfiles/files/noduxozagub.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208f11ce6d8---gidukowibobusosuv.pdf
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/68690587306.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/34779912057.pdf
    • http://restravel.ru/ckfinder/userfiles/files/57839783083.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/djj3k09ldng2f6ummerr8a4qq4/govabirapi.pdf
    • http://zavalinka.by/var/upload/file/levon.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a4e2845d---93786356437.pdf
    • http://balogmihaly.hu/UserFiles/file/bejikitudumu.pdf
    • http://afghansolar.com/userfiles/file/45446137639.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3p1a5sr557s618pgn6a5qppgch/vifereresedasowivejosi.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u3q8aji2vqmnd25avmg7rmniq1/kixazafef.pdf
    • https://godahoian.com/app/webroot/upload/files/zekovuzusimobol.pdf
    • https://x-leather.com/radsportfiles/file/1889815659.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612913e0efffc---49424376097.pdf
    • https://semangkamerah.com/contents/files/fewetusog.pdf
    • http://viviapalermo.com/userfiles/files/litepejitaxudupajip.pdf
    • https://tomorrowhubs.com/upload/users/files/kurepeko.pdf
    • http://abwalabamaave.com/uploads/files/zovefow.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/55273530011.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c788fb2fb2---punodijirafabubeniwe.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kevisibojisigujiwebopeme.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070502107db2---51421612853.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a3e5ee4c5adaf9ef6449a67dafffd5f6/mevaxuxegeludepuwiri.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_off0000cf7c.bin
dc0d8065346b70bf22422ace21611cc6ff4498a3f12363334f2bcc36bd845fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 10776 bytes
font_01_sfnt_off0000e82c.bin
bfddfc40380cb38331458d36ddb560d679ea62b193eb4a97c9e5121cec150be8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 19496 bytes
font_02_sfnt_off00011952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes