Malicious PDF — malware analysis report

Static analysis result for SHA-256 def2f16bbe76cbb1…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c8fc862af271a281bf22281a3887152 SHA-1: 75ebb4af740db95532321af05b056e78725d16fc SHA-256: def2f16bbe76cbb1d8dadbcb46c3b568b4bc10372bc3f81e8609a036bc03ab79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites or for SEO spam, contributing to the overall malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608adaba33f1d---99420142265.pdf In PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2d88da39f80f51dfac5482d132dc0334/vilazivovekawoxoxiwasa.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///belofuwumanodiwo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/toxetisarupefopufukemi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/39194957937.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xofugaperovajoderax.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/34590937757.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289d53831c---guluxapizadusa.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/nanijetonunorupexav.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/99938495628.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/lesapulegavixeb.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/51236660908.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cead0a0ef---27007523908.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/51244404480.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/96ec8a5771008130948dc46d34c9d7ac/83982120410.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f393c88c8---nakirewexi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lepolurinepanaw.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/80388293013.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30d4bb85b---16518915202.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841ef47fb2e---tijujupilokuwimaduparodi.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/baxiwedosit.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076542dd4141---nafifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hypothesis+based+science+definitionPDF 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_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17984 bytes
SHA-256: e3c0663faba89110fb6d77617afd91fef5167d18071284b36738d3e94d88a7fc
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 10816 bytes
SHA-256: 48bf218a8208b5023647df2bf3a59bf1e55be95104897d42d1534af16cfa4bdc

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