Malicious PDF — malware analysis report

Static analysis result for SHA-256 690285104e6bb405…

MALICIOUS

PDF

69.1 KB Created: 2021-09-02 09:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4a657766cfcdd7ee992388f79827825 SHA-1: bb69a9f6effa07b0d5111a32b285b57003c9979a SHA-256: 690285104e6bb405618d03e053b584d3db981d14aaf6fdfc473a4b55bca10a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://psfund.org/public/uploads/files/cms_files/92261264327.pdf In PDF document text
    • http://kadh.kr/bobod/upload/file/mozose.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jaxoze.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/sewazifapovuzag.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/19268168445.pdfIn PDF document text
    • https://davaocarrental.com/images/file/wiwivuzagiziramuk.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eabf640ed---mowon.pdfIn PDF document text
    • http://thaide.org/userfiles/file/nutirelijimejedowukil.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602101835348229lgog4y.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/lomakedi.pdfIn PDF document text
    • http://51www.org/uploadfile/file/3f5346a098af072905031ff07223c641.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/dabodurosunijowezun.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1d12414b---28459123656.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/19563880911.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cf942144650224f131e2495d215195e2/gixifekub.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/xodawobinasezalofe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bbb38lb6d8o073rcl1cf2dr6t9/ridirag.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/sedapiwiniv.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/336063997.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/adfa899fdfdf3152de5945b3d9805644/luwizaki.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/93217230202.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/84398610978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=i+am+very+enthusiasticPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 15392 bytes
SHA-256: fabeb2726580971073ff6dc3bc161ff31a9e8f2f522b5088d591eb5bef4caf1c
font_01_sfnt_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 10560 bytes
SHA-256: 9398e32a88fc4e10f60f3911c185ea40681eb9004edf726cd41c272970aee44b