Malicious PDF — malware analysis report

Static analysis result for SHA-256 28369f3b3391ad41…

MALICIOUS

PDF

85.5 KB Created: 2021-08-19 01:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e10bf25451fa2fa05e3b0b7b7ca2646f SHA-1: ce671bffad8bde15173d3a98becb4b806dd6c3d0 SHA-256: 28369f3b3391ad4197304fabea31e6ea197e3b2acc16a4aa7f82b65ebde077e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=muhammad+yunus+grameen+bank+pdf PDF link annotation
    • http://jhdjt.com/images/upload/File/bozixuwanudonafujutix.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/apmikd11q8i41d2he7sba23vjo/vikalazanekuxukug.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210629_031533.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b4048247d7d5b613154003163547a9f7/22805209405.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e4eca7941---9135164675.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/54336793279.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/951bd24c51ae9254770091473bd0df32/79978387224.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/31094401635.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/91585522755.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d802b1e83---26198937904.pdfIn PDF document text
    • http://darstin.com/userfiles/files/gukufuwawovifakodawufutof.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lbkmabhn37l7m8g6pqro6gb63l/42075148489.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/75926140198.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/begurapixiwelalimoriwapiw.pdfIn PDF document text
    • http://mousike.it/img_ins/files/85654156321.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gehvotns5sphgseuea69h4cabv/24466502020.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p089a3is668hfiuhfiuu5h1m8j/4509910150.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5ede6e9e95a85b3de8a56e9cb4ad5511/rasozepavajekajazi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd7dcbdf3---wuxila.pdfIn PDF document text
    • http://freeski.hu/freeski/file/kodiximovonukupuwuwis.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44k85hdjmo7nn9khhjobr19ud2/latefuxekemuxoda.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/90110609732.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/63947090951.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/riruvuzi.pdfIn PDF document text
    • 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 18908 bytes
SHA-256: 2464778ed204b988548f989a168404338891bf01fa6aa0bc59400ef25694fe6e
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 11028 bytes
SHA-256: 420694d58b335c709bb1321b634be4461287a7173413c059d3191206524ea6a3

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