Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af5b111948ae766…

MALICIOUS

PDF

91.2 KB Created: 2021-07-20 15:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02c9e4b58ca792ed73ad5dfb9213389c SHA-1: 3907f441d908dd2a2158a93e5cbd59d8d30405d3 SHA-256: 8af5b111948ae7660b58c002969e12e6678134f623d865134a125311fa126913
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f6d39afc3---berapurujoluf.pdf In PDF document text
    • http://klefmarken.se/upload/file/livup.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/297ea3af4748958c004840c03c1cf55c/94975742092.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3f205cf4---xazojevuwoxuvolup.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uq5mc2legmdemp4khenkmts9ac/gejetidoweduvenuvo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6f244522e5dc10b72c255b6ae02316ef/woxazalidogokaxokezoj.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/15718339516.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rv0uqvvnr5rtdkoj7lv24gtkm1/fetupuzojerejazimo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60731deeff35fb9a622819393dc7b729/25081150895.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961778185fb---90068481670.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c67fba794---74503554228.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d179cec8---tixajekuzitijo.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/60285229018.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c39e7e39d---43305469915.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88064940318.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/kefevugiperupaziw.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kuxibonasiperagisuxomijis.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jaliduxatoxat.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sadidiluvuxevadox.pdfIn PDF document text
    • https://energooptima.hu/upload/File/63761510703.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bd6bca7c935dee0ea634a41f17b6fefa/sotiwax.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cb6b0d89212f0cf7b1d2c0844e5960/47115202981.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/dufijowurukoxosabatejiwi.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/62491881119.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gtfcjsveql0hr18qj9krhuce5a/tudopedinewurupus.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1bea53d6047b97207a49867a49cda4e1/61108160473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=movement+speed+singedPDF 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_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 10488 bytes
SHA-256: 96ac7925b0abe3bfc064d81af5437b4082d96e920b9b1716217e23ed28d09a51
font_02_sfnt_off0001332e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332E 16960 bytes
SHA-256: 1cf3bfc007d53cf925b1dbe39b854a4cd6f6f657caeabe88fd177a9782022a3a