Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ea9302695a293d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 03:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237e4f03434eeb5c5073da5f3a76ef5d SHA-1: 99b3b6d34d2faf1016a3b5baa3a169844b8959c9 SHA-256: 08ea9302695a293dc67c48b5be554ad0ba5528576552f32af69508ddc59e02bf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for SEO poisoning or to distribute further malware. The presence of numerous unknown URLs associated with compromised CMS upload directories strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7e4b623ce951e5f65689242619bd8576/ranagaliwadubepin.pdf
    • http://bright-mineral.com/uploadfile/file/2021080422321177.pdf
    • http://logistra.fr/ressource/site-image/files/pupojavinapudifulas.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078b05b45c83---86171828901.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c2249715911---62136927248.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b47b14889ecac74986158cfe494eb477/56774071314.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/avlta0alqhn2m5cnv9bq7tiang/83872558456.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f238865f0---49015102896.pdf
    • https://ctners.com/ckfinder/userfiles/files/85338257607.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3bb96496---57371276456.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.pdf
    • https://mmagame.com/userfiles/file/54958952656.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffebd322a1---fepujarerirebewib.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1j1jo53plc5e903kvhtkai9hr6/lelavuguweweguriraduwuxal.pdf
    • http://slesnick.net/userfiles/files/bojorewaseguxexapujazon.pdf
    • https://shibbirs.com/media/files/99763164059.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/zivaxizisadigenirudatu.pdf
    • https://ovth.ch/userfiles/files/segaxinezimax.pdf
    • http://residenceraffaellotorino.com/userfiles/files/31750067781.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b74121ab---42611702226.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d448d565c0---21960528016.pdf
    • http://malbreil.com/userfiles/file/bafiw.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f664eb2499---samuwexixunejenusezap.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/rebopofenupubugufo.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120137b88da9---55240188722.pdf
    • http://farmina.ru/uploads/files/28540906469.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=large-scale+mammalian+cell+culture+technology+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_off0000c6d6.bin
b946c7a7ff99ae624c0f3ac64f93c2384c8dc248f17e6019177e90bd3b9a21dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 11272 bytes
font_01_sfnt_off0000e0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
font_02_sfnt_off0000f907.bin
7a732e788888e385ee16a481b74bb2bb59229e37b2f2769aafc4963c121b119f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16664 bytes