Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43475f6361abd7d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 03:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71d4a44b40ec87f18b0c24fd98d489a7 SHA-1: ef2a74de59c7133d2ea3874a11646c2957849011 SHA-256: f43475f6361abd7d130b633f3734245ba4ce24aaec82bbb755b9b99449ea2d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=is+there+any+way+to+recover+deleted+videos+on+android PDF link annotation
    • http://drivingtesttips.ie/fckeditor/userfiles/file/disapatafu.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nenimabaxabe.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/23813282475.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/73658970891.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/57031896226.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462081efcbb---37058094166.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/97043045796.pdfIn PDF document text
    • http://enricobarraco.com/files/runiloxoperosazeduvu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/zaxatutalijizoxep.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/64139346140.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/20667777515.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/buvogonewepidojezas.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kavuwenilezupisoxib.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911180118_654470528.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/40087303778.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/80914309014.pdfIn PDF document text
    • http://moretonassets.net/userfiles/60635848535.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/9124854675.pdfIn PDF document text
    • http://myphamasia.net/upload/files/71564549817.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/90661811768.pdfIn PDF document text
    • https://tigaintan.com/contents/files/makizaxojilebifamobe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2f7add3536c4643057bf8a2613b94337/98666204704.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/91251629238.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/15131517649.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912526303452.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9f87bb27ef73bc8c10f27865bfde7514/11671500028.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/xagikojunekoxonajulop.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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10684 bytes
SHA-256: 6b4ebe7c036b43e9baf9ae632c26c937a0cf7c8949cd3a54fbd390edfea3ed7d
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 18788 bytes
SHA-256: 2483e4d9c9eae18434b23ff0cb56774e96079153d8733b1edafcceb429ef389e