Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d13299b7a7a6ee1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 10:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 134114a03ca18c761d841fe29eb688f3 SHA-1: 0a78be330b9a96a17a89b623ce243a69cb0d41d1 SHA-256: 4d13299b7a7a6ee16fbfe5dc71d6fe485c857055dc83d7d17f97a504eb9f8d2c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. The embedded URLs are designed to lure users to these sites, likely for further exploitation or credential harvesting.

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6mbm5n263e8junnbv27sje445e/dufoxupa.pdf In PDF document text
    • http://izmirtavla.com/upload/file/92426718361.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/92750040757.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/70760186722.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/zububarukijenokasipumam.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdfIn PDF document text
    • https://ebooksweb.net/files/file/biwabexefaguwusuxi.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/20509148709.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/76470040418.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pevuwaraveladokuguwes.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/wusajanoweropuxajat.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/89610479537.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/3286186429.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/40205077306.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3156925a---xufewapalomidemosugewel.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/23834044467.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/jadelabipodusumuvusaze.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091212230788.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/xefufutogajajefigije.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf5a31bec---pukugijaj.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/kuxodedilav.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dadexirus.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/nusajiw.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/96349209231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=breath+of+the+wild+wii+romPDF 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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 19260 bytes
SHA-256: a9dd6f9bcda06e832964e55faa4dd78411643cd0f7ceb9fe6b1994fe53c5c482
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 10484 bytes
SHA-256: 70a36d2da03f676c39113184ebb702f2552f1698cccaa8fe60a6603d64835a02