Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73a01f5c73183ef…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6613e7f0346427cc37f15b27ba1abec9 SHA-1: 7b711c0eccd329238d1342055ae4d893abb8c3dd SHA-256: d73a01f5c73183ef99b6cd62241e687e29a61fa2132248e54334420106dca469
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to distribute malware or facilitate phishing. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' further support a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c492f5b90f---32669337982.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cf3726607eae924547ff1881eac702dd/fulizujazogodagot.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942999aa933---pikokugivosi.pdfIn PDF document text
    • http://myesen.life/userfiles/file/dafodekijexatar.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/57641821738.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/99172195095.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/lonegitise.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/mebudo.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/lizopefilitupitubixowoz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0618b9bec---sisudogajinuzobi.pdfIn PDF document text
    • http://rld-carbon.ru/file/63350874830.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee5b6e077---66355255967.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16105b1599c0a2---91191398520.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hc2qkuhsalj39nccnrf4feun0n/27212989876.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/49056936371.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/94465116213.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/86213985342.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a2f5f5a629eed5149ec82495c253489c/36460621107.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9688f2100495f901aab47eb1824e7fd0/29374494641.pdfIn PDF document text
    • http://landpas.pl/upload/file/fepogudawili.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/99433851647.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/84867ec61999a4ff5e0116048511e20c/54701819283.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/okcec89tt3bo30634vtn3r3eep/rirerexopumel.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/setiuad6b9djc111daegvf6h0q/zogiwevivun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=icas+past+paper+free+downloadPDF 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 18352 bytes
SHA-256: 0ad7424b128cc0a41ff1a63c81f920486ab5646df63f2d5bb0d15e1756cc9aef
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 10560 bytes
SHA-256: 9806fc30b5972602a6d5af57a5cc090b167314e005fb9dcc5fc1348f05e9694b