Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafd872d694cb349…

MALICIOUS

PDF

80.0 KB Created: 2021-06-27 22:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1baa51cdf44fd46e999208cd7cb6df52 SHA-1: ae78650d6f761acf4382a6299043a881662221ba SHA-256: eafd872d694cb3496a0466c06007f83e7100c42389aacbf0072a7a01fbd88714
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, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=real+hand+cut+with+blade
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5974ceb6d---zerosuwurisi.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b259287f6---rikalalu.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9c7b0746ec4dbb1e943cd0165e909e29/povovopujiriwug.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/75134d83071484dd796036db6848b5b2/76047213446.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160760a2ac0167---vifasitaziwunuvezofulabi.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7pscckuhi1m6fchkab4vacocir/woduveveregavonubul.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/50c8bd02761b863ca7581680ddd695e0/nefimisopikezilusutatuno.pdf
    • http://grafichesirio.com/userfiles/files/suzuwavatapum.pdf
    • http://agcslohian.com/userfiles/file/wetimitu.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedfd8f4b0---38415285842.pdf
    • http://grandrosso.com/js/upload/files/todumobedexa.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/771ir8knt2g4us2o5lg7tfrgkd/70407417782.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c506bd1c5c8546f8e63179339df67433/25280047851.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3898fd8a184e2ba6060d78270b51b0fb/53467460643.pdf
    • http://alexlunacoach.com/img/editor/file/jujapeket.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabcfb6fa39---lobogijisufuvofetojisak.pdf
    • http://kfbi.ru/content/file/bulobobuk.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gv4fq9nj3fe9dmfsbc831p1c0h/ponaligaluderowubawifavu.pdf
    • http://teplolux72.ru/upload/file/45348853673.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7e2c3874e3442fec9ef6b4e40e1c21a5/toloribifaveletafegix.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/16718725999.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e8323f9c---11179121153.pdf
    • http://agcslohian.com/userfiles/file/55285204328.pdf
    • 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_off0000d956.bin
710e12e9de82f409a654bd5aac92c2385ffa06996eb6f77b6db447761d91388e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10448 bytes
font_01_sfnt_off0000f0f6.bin
4dac3f293feea4ca98314b9088b7bdfce26b94f43df27cbc0b5ab2566a310624
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16268 bytes
font_02_sfnt_off00011ae4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes