Malicious PDF — malware analysis report

Static analysis result for SHA-256 df993744457b6e03…

MALICIOUS

PDF

77.0 KB Created: 2021-08-22 05:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a9256f23d0c8180ca910ee53e97bb879 SHA-1: b22f46e1ac29a01eee2f29e09f13ef2182bd0423 SHA-256: df993744457b6e031bc4198d9e6bde2028eaf69c12be520d6deabb4334274e64
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the presence of numerous external links and the ML/ClamAV detections strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=radhe+krishna+ki+jyoti+alokik+ringtone+download+mp3+mobcup PDF link annotation
    • http://mbcasc.net/imgs/file/26223972968.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/748597e5aa63735a2739fd0e7684aa07/vutezuramajasubisewutu.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/63655985740.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/farukisimixurikuziga.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zepejem.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638163ed89---vazagapojelujogitowazomez.pdfIn PDF document text
    • https://esz.jp/img/editor/files/vowef.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/tukifeguripuxal.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5ac477cc---96204248983.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/lisuturum.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a188ebb72e6f523fa3176589d3aecae0/43617331363.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/tupofaxu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0dbc6893cbe74c598e9c47ee41463e95/73869443284.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/83a7cc9eeb013961d1a455ca5ce06a67/vokafumugakutugixowiku.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3418df309f---16813896415.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16103147593194---19131352629.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bec671e3---dedixematuzuzevokew.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f7b73ef4ec4bbbe33fd641016c16146e/xezewefa.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a24997294---kumarokuxa.pdfIn PDF document text
    • https://harom.ro/files/file/tejedo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/deluluwenazolojobesezod.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wamilutugis.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/napakupufejenaxajosibozi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/672f9f6da27f43fff51b45aabf93f7cc/77409710388.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/dipapa.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/gogizizopawe.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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 16592 bytes
SHA-256: e2b8690e23127c6af184f83a46c0de3902a9cebd46a1de8bd5f08f3124c9ee38
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 11840 bytes
SHA-256: 7d6882d5eff1d361c36da0bbea5fb9e223c660c90e66abb507ffe9936cd1d450

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