Malicious PDF — malware analysis report

Static analysis result for SHA-256 666fd50ca9854b48…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 22:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb9fb0155ab74be157e0927b0969458f SHA-1: cb3d14210eb18e20f20a7257e857a2f9c1dfa2ee SHA-256: 666fd50ca9854b48afdf20ba07b81088d31ad06d20df64c702851a7a505e6b1c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://aaz.sk/editor_uploads/files/zekatitu.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35631c7e90---ranudijapaluwedarututak.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/16730911137.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/1accc63b45dac8da960fdc1be2ae316b/pitetunetusus.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/wenokirabafiw.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3a2vm1qglqfu1gm8dm24c6cd50/jajupemeneliwuj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b7d499b9---werifibosofipalefeda.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b299736d---fizinuwovejer.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rqdhnjqdcnk633sf7sa2vn78l6/kovenef.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/toforubonerovafiserix.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/resufavuva.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b046488e579edaa64ed0061a7c90aa44/36339680576.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/54781291815.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/tobawomino.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/90529084168.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bnv3cu790ah2lq2hkavlm7mav0/26571836512.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/82403074300.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/lujeka.pdfIn PDF document text
    • https://bliznacite.com/files/wirasidumagijalipe.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6mp2bvvigleim0b39kbdqvt61g/87092292646.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8u1mp20s1nc58ch7p5o422f37c/12109621567.pdfIn PDF document text
    • http://kme-kme.cz/files/file/80669149029.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/deziwiwetufumabewirixum.pdfIn PDF document text
    • https://windsbs.biz/files/file/85747612813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=barbie+life+in+the+dream+house+full+movie+in+hindiPDF 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_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 17340 bytes
SHA-256: b510dae04ff207a7a0c372a436fc801abeb66e99698da9eb0fef9853dff1ec38
font_01_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 10976 bytes
SHA-256: 5bfa88b272c45210dc6b0bf50f11df6602873c53ce4724982f77a954c73cb1bf
font_02_sfnt_off0001438a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1