Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b91a8bea27d932…

MALICIOUS

PDF

77.9 KB Created: 2021-07-17 18:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71517affa2601f7247df059231906085 SHA-1: fdabb57c9d70325ef6a555a85afe51acde35866a SHA-256: 22b91a8bea27d932e1656cc5dcf56fb738b419e660b2d1c703f7325dfcc56baf
172 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 and disposable domains, forming a link farm. This suggests the document is designed to lure users into clicking these links, likely leading to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lateonsettay-sachs.org/userfiles/file/vasuselenezigosej.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/28244643208.pdf
    • http://b-solutions.net/userfiles/file/17663352063.pdf
    • http://yanarfabrics.com/firma/files/62097160675.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/51467609813.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e4163068271d97d39e13b4fb4d44c9ce/80726496312.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/sojoxuda.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5cbc220df7e9c67af7fdf4c7a99b812a/tijifege.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/08dsssg8s5cd52tpn7kojtnhv3/sukudasuvudaroxu.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/90a9ab21bfe96d4bec4281f199054389/47080451393.pdf
    • http://www.tekkoo.net/images/library/File/wibamuruwewewatuwasuped.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdf87b5f---24209909020.pdf
    • https://bczenekar.hu/files/file/82335593448.pdf
    • http://sugarfree-gelato.com/upload/file/sasunewoji.pdf
    • https://chupwo.com/editor_upload/file/19689224826.pdf
    • http://saigonford3s.com/uploads/2021-07-09/images/files/17417300919.pdf
    • http://envigest.cz/upload/file/12095931478.pdf
    • http://sztarmedia.hu/_user/file/ruduxodaxosaw.pdf
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zarodikorokosake.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ah0a2u3k76apfc5kuckibgm27l/78268048341.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f51ed8b92c6f8646c75b96129c18bd4b/lonugiz.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o8pd6iin95ehsgurkckcva3kl6/974912921.pdf
    • http://alexlunacoach.com/img/editor/file/37584588686.pdf
    • http://samafb.org/uploadfilefiles/70448788629.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chapter+5+mechanics+of+materials+solutions
    • 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_off0000c473.bin
0c99aa391095fca588f2276d74a52a9da33d955e389f04499a9eb289048625cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 19308 bytes
font_01_sfnt_off0000f6b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
font_02_sfnt_off00010ecc.bin
14e6e2c5db89e47bda5108d6940c0eb997cf64b9d060d2b9e5aeaa6eb1ff7cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 11008 bytes