Malicious PDF — malware analysis report

Static analysis result for SHA-256 78485295183f5e8f…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 18:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa44edbb48d9c1d6e26205c465a1050 SHA-1: 5b88131925ccec8df234ef2e0ff259e07d40e7e5 SHA-256: 78485295183f5e8f81622a0f16da5a4950a318614445025259f1e0f84fbc66e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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 https://aawyx.com/sites/default/imageuser/file/sexuxazo.pdf
    • https://delphin-bau.com/ckfinder/upload/files/36524584739.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d53f286440e0942b9115d4c561282b4c/82470422945.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/84391304337.pdf
    • https://securitydm.com/slicice/file/99923594343.pdf
    • https://zionapostolicministries.org/uploads/file/bofukogavejonalozoduni.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/19772839861.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088901d2c326---guvopawotot.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63d775864d---72154949356.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c4c755f2---43820241966.pdf
    • http://liccuza.ro/stiri_files/file/56096482551.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9452e5fb6e---losam.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iquioii5p2648711raoi5uggs1/tiseru.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/79dd813d6fa2a404f547d0dee65e78e0/56137195146.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d1750055---24349233659.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/21b4fdf1436e7b51c9587c7b412986da/lajotibanawufivov.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc437415b---wusizotabor.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d9ba921c90528fa8f44171b0f194b9b0/3588082105.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609703234c118---zuzomamodalijofavoxorin.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/258979846df26cfb926f6ddfc5789186/55381742235.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1870218205069596484db4f84673a032/wawolibudowevonijas.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/84425731369.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607483a2330d6---95931124928.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7b877a886a88abdf86bb28af0ac5c0e0/72937009396.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/acuobrfq64nbjq8abgmc6m2uhp/54499946925.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2d95e065a939a97ce8c7e0dd80452316/bovujegurotagupojakuzeve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+each+interior+angle+of+a+polygon
    • 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_off0000f15b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
font_01_sfnt_off0001096d.bin
c0c13488466aae694b9ab76b0fef884ab381c6e270dcd1a577c01d8cb8e0d96b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 18376 bytes
font_02_sfnt_off00013a72.bin
ac1b4a79711e4d5cc96812018afb9589c7a1e05194ac854fbc7a3c222f603d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 10920 bytes