Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe7f9fb312c6db9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f722aefe05be45f10ce76e0616c37494 SHA-1: 5f1eed370565fae7095a4f9d14375bf09e4435be SHA-256: afe7f9fb312c6db9d812517398cae68c79df132fecea8777b8645838f7c7999f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous links pointing to external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://resetimpianti.it/reset/public/file/43961795084.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/91791178218.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a64e3daa---29868133000.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5nh25vihigkekqf1sc9qmfeiva/98896636406.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607758d3e2bd8---50757814536.pdf
    • https://1877painters.com/FCKeditor/file/lipepad.pdf
    • http://lacasedescaraibes.fr/file/12498134153.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d740bed17---93653641608.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/zerivazazuruvivuvagiv.pdf
    • http://allycatering.com/userfiles/51687433261.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5d7f09314a339d72cba392fff9253a37/70945795976.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a598f1d82e8d4b8668ed99997c4ff8a3/dirinipuxagi.pdf
    • http://mlsconsulting.net/cms/files/File/kusaz.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/93cbde5b70df00dd9a60897952e87d40/lolewogefamube.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611679c5803a4---15595956518.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2e02c0626d22cfff0388e5fb99cb547d/sofonomiderezetop.pdf
    • https://www.naabelectric.com/userfiles/files/29410165158.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ac980b115ba54f4d966a0d196e24b81e/4111396874.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/37230197336.pdf
    • http://shannonlakeestates.org/fck_images/file/52322394348.pdf
    • http://kientrucphatloc.com/upload/files/fikituvagilirutogumodofoj.pdf
    • http://cmtoolsrental.com/user_img/files/87496492466.pdf
    • http://www.aqsclimited.com/EditorImages/file/29615075041.pdf
    • http://jgbt.us/pds/userfiles/files/33565882882.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=define+transparency+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_off0000eff2.bin
c8fa09a076b30c7304b9baf5fde165afacd86199e0772b69d648e09b7f5e20d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 10560 bytes
font_01_sfnt_off00010831.bin
4d60b442375ed68bf668de5330cbaedf4eaebf6a036ec22b49b6b99c23abbeac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 18864 bytes
font_02_sfnt_off00013912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes