Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0efb05747e3ae50…

MALICIOUS

PDF

90.4 KB Created: 2021-08-04 12:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 247564d7eda31ac638d65b75d790b5e8 SHA-1: c7a765b0ef13ec82853409a0d6f4d16f9de82663 SHA-256: f0efb05747e3ae507c4a656758c8b7ef7adda97c0ee72c34286745bd1fcf43a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://nhhs78.org/clients/63854/File/xosozavineg.pdf In PDF document text
    • http://eurekaelearning.com/upload/news/file/gerotejojodabejafejexiwi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/88e19bc6091cb0b24108ff17eb50511b/renojum.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bhpao038b3bs41j48s670ttr10/tesutulijuf.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bc39b9b4---nisekemopafaloxap.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/7785872798.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dac8fa37---18271198898.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/36374558090.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/mamejebonuzinevumogural.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mebifubaxezuwuf.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/87347869258.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/h76b6mfjl8o73ro83of2snh9sr/jonex.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/senulawatupon.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f4563b0a---36326527315.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/59940734269.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fidepujupop.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b8199fa42a44d85442ea973bb5332b3f/dejaxoweloxujisunerame.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/76932297757.pdfIn PDF document text
    • http://cycling-software.com/files/file/86501046727.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fojeworigaruxeb.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4bd62c0886543e5c5e317c7ca65c853a/fararudenoregesabukugomon.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/70107318198.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b4102cc124075c1b237e0a2d6efb145e/kupamedirififorumudefudez.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abaaad319b---pifegisun.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a2acbe30---gexefugalexovumurukuzu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095288421b6d---22729736899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+open+a+cannon+gun+safe+with+combinationPDF 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_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 17672 bytes
SHA-256: 59e833536e65366adc615d77e1a2c17587ffa37fbc6bed42bcb49de5a5364a32
font_02_sfnt_off00014229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14229 11096 bytes
SHA-256: 53f9cf3a3f90df587dd3bd1417c107d3766243c0e2683189f03d04fa2819b446