Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef11f842d1fab01…

MALICIOUS

PDF

85.4 KB Created: 2021-08-17 08:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b63a746a8bd876d2685725e964335d71 SHA-1: 5c7ca0e8a77d664a756ecb667e5928bfac7837da SHA-256: fef11f842d1fab0143c14c1d34ccbaa50d8b993f11c0dc1561c86714adfae50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://dm288.com/slicice/file/35479952965.pdf In PDF document text
    • http://akinmedical.com/uploads/file/pejatujuwivigetux.pdfIn PDF document text
    • https://soechi.net/userfiles/file/namapuromul.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/ragadavepusinadajitup.pdfIn PDF document text
    • https://badoza.net/userfiles/file/linofatasulepa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/54668275277.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/selejixuwafufidemagi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/537e2ac6327b4fd4c4ed12413adf51cb/limapujukusipud.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865a1b9339d---78236482994.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/077a1588cca722f1c59b21651d77d974/xarejerapixuxuwebaju.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072426669e22---53816152092.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/53344684121.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/gagobaxurebafapekusaje.pdfIn PDF document text
    • http://skia22.ru/pic/file/dekuxoxipenowurifuwix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7815a56cf6---54175001849.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/le18pul42t1m5bv2od4qv69khp/kerazepebawawepudovazokij.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7453ae8b1---44482524379.pdfIn PDF document text
    • https://arendic.cl/files/24859455280.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wawokezutovarezetejufen.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/51149351210.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/65097349248.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/peximuret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wahls+breakfast+recipesPDF 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10580 bytes
SHA-256: c0a02dc977e2bce688c2ba3e50260730998ddad2cb73d7d2d80023f0af5b8e9c
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16604 bytes
SHA-256: 44d10a39d9fbd199c475750b3d6f86fce95c68ee43cf16baf7ded0ad5828a0d8

Open this report in the interactive analyzer, or submit your own file for analysis.