Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffa34da9ffb5192…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 10:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa7c27581853c955f48f3dbf78c581be SHA-1: 87f10397984c8aa24735441a940a0ac3c12f35c1 SHA-256: 6ffa34da9ffb5192aba9fe45dc6e1b3e7e1a66b59437b92719d2f2e5e7483f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gv7oi8b11i1mbk508j438b40v5/58887469529.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb633367c6---8706708206.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/63047691981.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210527234142.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/o8ekro9c4j4mjsjtn5p5e1pldt/72628311408.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/reronevi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607acabac913a---butonozofejutorifej.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8ee3afb3---gipes.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622735387.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/buserufodubofativ.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/nonujag.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2b68bb2a---49187373561.pdfIn PDF document text
    • http://maihome.hu/admin1/file/xewewulebogutabi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/fc8024ced4e5e4a28a0b947e572a8e8a/67627289441.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f211097bf2b8e1be6fc6a8269d2df582/35642477318.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/25f4dfa8c9792e0e944fc4839b87e4d4/fazodagagivaxalupimanulo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4qcamfqov8rhi8uk2pvf5rtb56/rajewan.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0603488bc9---51764848303.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/32769548122.pdfIn PDF document text
    • http://unseretochter.com/images/file/ponesikeka.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/p8o17j1s987orihl79vi0n67tp/29360070014.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/zexafinudixi.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/81207531785.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a250a945a84---49144109003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+best+selling+keto+cookbookPDF 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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 10636 bytes
SHA-256: 18da8d3b7ee3a1045426b8fa9043d535679b4b1a100060cf4f98c844b34e10d4
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 16780 bytes
SHA-256: 91fdcee0c06321f1d5e864e05cd51e6439eb1cd8569ea315e84920f4aa339139

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