Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4573778129d669…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 22:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bdb1bc1ce410a9969a5f4637bf25caa SHA-1: c3499e48f71b11310f5f8e56c5127ecf90e97577 SHA-256: af4573778129d669786e758bd25f680a7370899c7e9b0b2c411ae4c962c52d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=carbon+fiber+production+process+pdf PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/83njktrfh20eektouikfkhpqc7/ganorejajijasizekox.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/knqafht60u7c9efunbp043nqve/56760980273.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7905b049---tibife.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xasekufupuxevepuker.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/jagagojedewarodazabijuz.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/rajojotimulajamuj.pdfIn PDF document text
    • http://altinay-law.com/images/file/74069081608.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a349dd960---zufekodu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cc0cd303ad1a8b560a1a339f02d51910/70836563769.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/78964940477.pdfIn PDF document text
    • https://carlojans.com/cms/file/wovafojiseberafomefitebe.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/felepipozuxagoves.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zokeligugi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/90de26ea006827603d42aa3c8c5ba13b/suzajipu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215211626105584.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8bcabd2024bb94cab5da58fa9b3faf63/4921467141.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b5fb9b107b8.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5f3ab7a739b50cf678fc2b5249c90257/sugekusi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/09210716439.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3c6b9bae2---74106041788.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/10337704626.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb55826f13---zunerajutidaniwemaf.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/26185531166.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161154f68c47d0---dolomelivolig.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/wuxewudamudajifevexumawo.pdfIn PDF document text
    • 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10836 bytes
SHA-256: adfcd8f95c41710a096f31201f2849742614a2a10afec1a923859da6b2a1a2e1
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 18964 bytes
SHA-256: 1fd5d150c130a006197d4d842fea8c9abb888cb8ef390c0c30c8473e76388e20