Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ac0f2873345c8b…

MALICIOUS

PDF

80.2 KB Created: 2021-08-14 03:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 962ca7cdfedf6b3c4bbbcee2e16d8119 SHA-1: 50881e29842987d884c966294212564a340f44ff SHA-256: 90ac0f2873345c8bfbd64ce431242669e731a61e7c433a03292cf6480dd08fa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The document also features numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://trumoi-khutrung.com/upload/files/58327737764.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9249430e---64581183470.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b85c3e360---magazutadof.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c567b0c4---92267712713.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c3603cd344e77bc3dd9db4e3c37aff21/73468427249.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/wabimolidivaxavikajeto.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gratqq11vt720cvcm5np0hm8i1/pewomobal.pdf
    • https://belitour.ir/basefile/belitourir/files/wekevuwobezu.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/rubonesiwolaga.pdf
    • https://michelbarbot.com/upload/files/vibom.pdf
    • http://vanillasky-ch.com/images/files/buputasujemalegaporog.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f35abcb35---bodetofudaruxubudo.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i4a3l8of87fpf0di7u7081tr3k/41086147731.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f32b8dbeffc---53514749623.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c947f2fd---51220895743.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073723f39329---87128019325.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6qs8ufdfl1n9fadhcuhgplm0j3/zozurenukovuri.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5d662c5db8b29fc5140483ae00bb147c/80840767931.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114c1256cfdd---65436474060.pdf
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/kekifiko.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8bjb1id723s8khl2lrgg4ucv54/47775658231.pdf
    • http://corporatiegids.nl/uploads/files/32032635274.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a474d7c44ed---72415985941.pdf
    • http://vogiantinhmach.com/media/ftp/file/dotogenifapozojamawu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28a947b0c---relagadiro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+green+kinemaster+pro+mod+apk
    • 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_off0000d606.bin
84dab420787e48c88cde58c7b7b53856b3ed242af7b29172a4d412dd2920e7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 10916 bytes
font_01_sfnt_off0000ef26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
font_02_sfnt_off00010738.bin
64eb5f417eadf4d27dbb27222a4fbe77346377e59ee394e1d86ab164166b9446
pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16348 bytes