Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f5beb9f8c9568b…

MALICIOUS

PDF

90.8 KB Created: 2021-07-13 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee99fa8684e5ba1d0ac9978339f9de96 SHA-1: a2f9190d44d9cd1afad0ebe315587567dea9795d SHA-256: e5f5beb9f8c9568bf98e4d3c049aa0ed94f95d39729f078c7c9e12eb07cc069a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cokhivietuc.com/img-vietuc/files/lelibinaxexarelok.pdf In PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/c1995be541bed79f8bb13880530ca02a/11627837310.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/2164229060.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/rajuxu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rad0jcq72dv03evtknjl101rv1/49352779066.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lgkkdc1sa6dg8dlccocd1b5nme/34241757727.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b831ec8c---69194444046.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5bfd02814---julazutejiroxega.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/050fba2df2ead7403a0319ec866585f7/2859496895.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608816068a3c4---95833970180.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/26519889306.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/fulapabig.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1cddc4dc8---78174182430.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/88580481502.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/94900497119.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lulele.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/68864279241.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/54622882187.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a0871718---54506297198.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ad8c8213543c398827b5e648d6a5d8f4/34804393186.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/pikekaxibexegimexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chris+daughtry+bandPDF 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_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16852 bytes
SHA-256: 1b29ba78247b3fb408ec3ca03654017bf91921e3f73349868c43fa81dfcd61f1
font_01_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 10612 bytes
SHA-256: 9095656364bd443e48960bca5a4da79b2451c4bc8aa3f759482af23fff892cb5
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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