Malicious PDF — malware analysis report

Static analysis result for SHA-256 be613fe1ec09e305…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 07:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64783df1ec3b24a440f5e8f8f358c52b SHA-1: 17e9160f7713286e0bb1b120961db72993a7812e SHA-256: be613fe1ec09e3058af35a7ef826a30a3794e1748ee8bd4c973be2feb613fed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://king-pro.com/userfiles/files/sukomidu.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b92f3ae823---zufir.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142341caa6d5---44785319651.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/53300074797.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/pazejavaruruketop.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161448ed6953b6---75525390618.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/21b32a55721eb4924323d7bff7ed12b0/82550582954.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/galusidap.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/fazixuzob.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/8062024304.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/51511722245.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/jupiwuk.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/migatumodubelagifoxo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414902ac071---66451995817.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/74702500792.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/28953490744.pdfIn PDF document text
    • http://bushurov.ru/images/files/kisebivoxox.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/38622974681.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/dukamuk.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zijude.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/nupuforof.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/bofupu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/woxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=toca+boca+salon+3+apkPDF 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_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 10312 bytes
SHA-256: 6021bb458ad0c0c2f60b2b5cbb6151e4d613e90f0ff7d9bec71840f1ae950731
font_02_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16696 bytes
SHA-256: 9b20a8a8ad7780bbb42a448bcb1a91dc19d0de3e729287deac8d5e5362a904de