Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2605729b59b51aa…

MALICIOUS

PDF

81.2 KB Created: 2021-10-05 22:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1692794611a385a25422cdb7ffdb7a84 SHA-1: 3d9adfb1d78612ad7cac056b3df99248c460a3e1 SHA-256: d2605729b59b51aa62c77812d39ed9e3c7bbb3e5280ab55b0dfda86abba28e33
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/a06iei04fh2sc02lohd9liq1hu/xosawetadil.pdf In PDF document text
    • http://voyagerav.com/v15/Upload/file/2021923730116242.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/vasidakivexagejutinupigoj.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/67129019305.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/vogufajopijadoxebadewavek.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/6156761111.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/48927052491.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16144c71542386---zodakutilubejumumaloral.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6b73c5534---66950760685.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/93589612343.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/katogoxuwasusuwuf.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071536009955.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/48032735434.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/sopurono.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/58089451249.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9a327c239---remilifugazejisajapidiv.pdfIn PDF document text
    • http://isvpro.com/custom/files/83142951503.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxofafawajawanunakilirop.pdfIn PDF document text
    • http://lgassociates.in/uploads/29557326830.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/63843154468.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/12915329187.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/8064282997.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kinitoxeluzikixolakapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hiit+weight+trainingPDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 18224 bytes
SHA-256: 7198b5b15da27109542352dbfdc37d47f379ce67a3d0955b9a0cbdd1f6dffe01
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10132 bytes
SHA-256: 1004acebe3fc23f901536f8f02079bfb94403bb25a2121bcda76b52012ae30c2
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1