Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf6c82baff35e2f…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 11:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 87c0043e665c00c1a0420d560c9179c7 SHA-1: de1433c851a49416ffb21025f180e69040e32c5f SHA-256: abf6c82baff35e2f8e085cdc5f545fd970193b229c37740e9523aa7ddff682e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious files.

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/366ea468f588da9080dc3cc43c4ea1dc/36987722951.pdf In PDF document text
    • http://greece-ex.com/21503348664.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0ccb7b415ad684b134c99f296317bdda/43578479515.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27a9a5fea---sukuxakobalan.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/pj9vqsm9c3cpnuf73urav6pjso/jegepegizuxafuzudupifej.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/sixagosisegitobop.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998dcfe9c46---bewaronosa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfe598e12---42262570505.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jelavekadutefetesitun.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/lufane.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/670cfdf3a2150d6f7cbbf0a6846c1d6e/xitikasutaxibe.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/35206685524.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/64844880984.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/086a6745fd579006b3ca1940e96587cd/fedifapukesa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/99628357536.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a6a247605b0b5f24c43af56dcd3f69cc/penopen.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb5ce305---6295747899.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/5052570842.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb9l53q026qoo1v6um656rpa/66565453810.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/balisetel.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5940831dd---xugoxe.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-7/20210507110421257008.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/2952298646.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8810624410625d6721a792a5a7eeae65/5168249441.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a6d8ccf1408b68480dc59e7c34b68b26/91094051251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+grand+nationalPDF 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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 10324 bytes
SHA-256: 40542ca6816df1f73f24c14837ead4957fe2160ebc7fb7ea7d5d516d58c61b36
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 16600 bytes
SHA-256: f2389f46bdc3f38a11fcf9ab9883e75d5af31be4da3b323afffa5afa1b10ddb7
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1