Malicious PDF — malware analysis report

Static analysis result for SHA-256 8888a7da268fae0d…

MALICIOUS

PDF

87.0 KB Created: 2021-08-31 12:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f8d97c51f6dc71d73ecb593510c90e3 SHA-1: 7544e21749fbdcd9892f073ca0af391008806e06 SHA-256: 8888a7da268fae0da9dbda53373c24c780b23d5dab23a750619981eb6964ef4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple URLs, many of which appear to be hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wojno-stal.pl/pliki/file/18076609103.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/tofozexerutigupab.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c59cbfa96cf---faterepuzevipup.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/gibevavesanepesesuzidogop.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608244487cc0c---68457514361.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a5193c66---limugibax.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160caded112ca2---87956040086.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/97371590a156120b5ac24fc1e47f8265/mobupagiterixip.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ab5f2a84---11848128149.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tloubc0po8iq7fbpq2utted1j5/2001206225.pdf
    • https://www.thaiahpa.com/flash/files/zasubazeno.pdf
    • http://brmhn.com/userfiles/file/20210630133104_giggy6.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e02127cf5---lasofojurojajovupodezuxa.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7587a26969---fopodefumititewukol.pdf
    • http://billedbutikken.dk/articlefiles/file/wulaxosuz.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/67026102093.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bpreph1bquv0n6vjq5996b4sv7/wikegulowamatuzorozuxutid.pdf
    • https://diaochue.vn/userfiles/file/90153178001.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/dbb0b6rds1lidu46e6fl6ep8nn/86277657265.pdf
    • http://munnarinfo.in/userfiles/file/92574775676.pdf
    • http://tks-forever.com/upload/2021/06/21/file/92332819648.pdf
    • https://termocasasrl.com/file/begikoxutetasavobigimud.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ef118b15d9dec67241cc6757d6a6467d/wexobajo.pdf
    • http://henanshuangxin.com/d/files/silileguvofupovorofo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+handwriting+to+text
    • 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_off0000ef38.bin
6f4fa8c336a97e7c6d050f5c7945e518e6ffbecdeb09f80048a5e914699c9528
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 10608 bytes
font_01_sfnt_off00010743.bin
07b49b5fe9f05faada27a7a3fef56dc69b0a6c7b3442e3c88f325175540b08fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 18072 bytes
font_02_sfnt_off00013675.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 16792 bytes