Malicious PDF — malware analysis report

Static analysis result for SHA-256 783619a6e63d324e…

MALICIOUS

PDF

86.1 KB Created: 2021-08-18 21:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8573656a786052ca1bb2b4fdc6a9e2d0 SHA-1: 656451e62636861a1906f401b3e7df1c25c62325 SHA-256: 783619a6e63d324ef0953c4ed51ca1774a4b6a24911d2c98aa5f597fa70ff5ef
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk2ic1bd7ueccteafnudofkcvq/wizuvabevawuxipomatexefu.pdf In PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/61267337452.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jblf695inin234emlrrfhjq3b1/vemedajuruvumakisajavumap.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/sevifezug.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb607e49262---63186928166.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/89207381367.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7c3aba7ca2482c7b0218f27d66a9b1b8/parirerebubobutejux.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bda05f73b017ef8a08d645b717ab38b1/32171598773.pdfIn PDF document text
    • https://olterus.com/contents//files/80293728110.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/41254199158.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/bituzojubesafifexi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/91363158f4e206a9e1a6a29e7deefbef/59806530228.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/51284700491.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/rufutixosenopiva.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/82429597566.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9b4a78139eeeac0f2bc18b54034479bf/vakutonok.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061eac298c---72427214337.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ae72f086e77f21c8533a5f8a5596e2cc/pikepiwazevulamekew.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092950310f7f---6088188574.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/57656096931.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/10829308324.pdfIn PDF document text
    • http://iwort.de/userfiles/file/matedajufakevoxirosid.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f743ede2ebf7f2a24d49ae3329ffa3a3/nurofepobuwaruxetusezumeb.pdfIn PDF document text
    • https://synersys.fr/contenu/file/983851341.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/77444913182.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/95641344540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=raaz+2+full+movie+download+480p+filmyzillaPDF 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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 11292 bytes
SHA-256: ccde94e99245d4059ad8bf2ed5b4abb3d6134f08c0a9ac7336ec051e2ad63a5e
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16860 bytes
SHA-256: 7ed86f1c2590798b4164e55b6aa21a08a2d06f4cb751684648393cb6ad88aa61