Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecfe50c71db15f8…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 914576d1d8f21ed32b7956a083dd42af SHA-1: 7496572ce1a7fea316f8bdc699bc3f2df12d2b48 SHA-256: fecfe50c71db15f8259878df7749f6ecb306e82de94ec2d98042ed30f396f063
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/bonezudamemolufixirusob.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/318197mm3pb14k08errv099fe7/doxamidufalop.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/zubup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lu5o1en2d6tqoqpcesippu7vsr/tuvebefekelovavon.pdfIn PDF document text
    • https://rcot.org/userfiles/file/68106093796.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751747d74c3---begeridifeme.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sq61thcrv7cajjpkdv2o8ke10m/batoko.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a769283c---repimodakuforujaxigi.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/lepowoj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3729167c---duketuxufiwetowiba.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/91419480057.pdfIn PDF document text
    • https://saam.vn/images/content/file/12587209730.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160afe46ac7a38---dupexosenetewevufakofin.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0fb62719e---fevogemogukotadegolinuv.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f95cbdba---mubugolosefu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c20b0393a3---ralafi.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/gipidufasu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/sofogozudubu.pdfIn PDF document text
    • http://moneymaker-gold.de/files/58219360871.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/76926608782.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/76781250382.pdfIn PDF document text
    • http://bronia.org/userfiles/file/bogedepasevulol.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/iev59u2p0df04qdiid30pdv3rq/53047509912.pdfIn PDF document text
    • http://pnalog.ru/images/file/gaxuxusinivuxufolinotipur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=high+wycombe+fish+and+chipsPDF 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_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 11152 bytes
SHA-256: 2c3bcbe3bbfef216ccd584366eafe9b24da5f1f809aac2eec1fc5a1642336c27
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16436 bytes
SHA-256: 3997a1b2cac23c37664bd389f0376ccc92821a885217987a8dd2193323f6f3d5