Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07087098c4ca416…

MALICIOUS

PDF

98.0 KB Created: 2021-09-22 09:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7722d0e89f6c6fcee52b4fc4900ad2f4 SHA-1: 27d9c9ac35cd891cfb35faa7261793ab539602de SHA-256: d07087098c4ca41680c7ae5133c7da58f09dcd517575c1fe9f2659c4be212ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=the+second+largest+country PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e487b69482---51653970244.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/99690977359.pdfIn PDF document text
    • http://tencanpowder.com/d/files/59052758231.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tk0rrfio0fablj2vrdb8901qo4/21191919057.pdfIn PDF document text
    • http://edituj.cz/res/file/57187996510.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/fujiduluxesaximoleju.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/nuwiveruzam.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xasek.pdfIn PDF document text
    • https://hoavily.com/uploads/files/97980422571.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/55821741616.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911162422.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad837dc0fca0214884efc09a2fb0b8ee/fotegowadibeja.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gedes.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/3606937130.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/13843304898.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/levogefuwajozumimu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fejuzadaxoliwe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n2umfsb3gctisdkpg507kpvi64/wexaguxarun.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/14869973036.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4hhqjpcel75gesoj6buj08d9gh/6640654335.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/delakipuneraruzugavoboj.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c95b8375032de9ca745c46c513c554f7/27113650846.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zisenajavuweni.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/44555497749.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_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 18752 bytes
SHA-256: 579ead645dac960cc5adbee90edabe55f25f2e1caa7ce5f731f39be2e48090b5
font_02_sfnt_off0001619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619A 10732 bytes
SHA-256: 951c3aeed7bfc419691cb44558402a56c52688348d5b6255d0c549017e346c36