Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f809c7d13fa2c1…

MALICIOUS

PDF

77.0 KB Created: 2021-06-27 17:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf0178812fed7911f803bb7beff678d6 SHA-1: c9c23c2b9960bee03978555db7f56feeffc34612 SHA-256: 17f809c7d13fa2c17d490b4548a19166f69ba8187383148f9688ee6f8972574e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15eddfbbb---rofor.pdf
    • http://www.specemc.ru/upload/files/15322949201.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4icgek8pic8i5u6q3bt4nc7prn/dipuwepa.pdf
    • http://banhangcongnghe.com/upload/FCK/file/10760417466.pdf
    • https://bednidhitraders.com/userfiles/file/38909859915.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4648f4e---nowewanebogatuve.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/bukos.pdf
    • http://motoren-adachi.com/js/upload/files/vupogowef.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/99586554eb92190536ab5403472eebb2/bosawumesamaze.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7qovjr9i29mrj73tekgj66ai1/49674376142.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1a0c6ccba72c116c284df678b1b7223e/gulolidepinisoxe.pdf
    • http://schmetterlingsgaerten.de/file/nosakazevazinowoxukutu.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca75d8e6b---94192565031.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e48796a0a4f53ea0b0557efab902454f/95392738906.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8443bd96---pokaxexalivavofojenenuv.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d498f4d8a7---lasajumuvajizis.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f522c1c6aa---99912681023.pdf
    • https://efnnma.org/files/file/kebujojenixesemanazezivu.pdf
    • http://snap-drone.com/userfiles/file/domaseden.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9b5ecc63---zetepu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7cdb1edb230b637104d6932d56dfe92/puxikofodufelasixataguvum.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/31421467471.pdf
    • https://jerseyshorepirates.com/userfiles/files/20708930555.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=employees+provident+fund+act+no+15+of+1958+sinhala
    • 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_off0000c770.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 16792 bytes
font_01_sfnt_off0000df82.bin
24df646d3d000ee9fb4922edcc4e26d3ec5caf4c2a36946a3d38d60879a8421e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16556 bytes
font_02_sfnt_off00010a6d.bin
2f9cd969f1f9f10a5d8a8525cf307b6b6beae3209206678e0bed46d228708608
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 11708 bytes