Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeaa74033282320…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 11:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db9ba7580088bb4be1f30dbe30b7bd91 SHA-1: 76b6995741b046b6a37d3cd7c9978e8ea6537785 SHA-256: ffeaa74033282320bdbd168b84fa9985e0af87f6cca236422736096261e43e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to other PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a spearphishing attachment used to lure victims into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dotcomtravelegypt.com/userfiles/files/jedofa.pdf In PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/78843957960.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/46783171360.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1d504ec5e7ee9387ae408c7886085d3b/45172485050.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/96460680215.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/54500210704.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/31021473260.pdfIn PDF document text
    • https://tch.lu/files/files/xebenojij.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/segujofafug.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/28474809055.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/88586906722.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/mogefikemoxemadosozevad.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/5136754886.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161352dfe9f27a---65336156322.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/53116959374.pdfIn PDF document text
    • http://premo.at/userfiles/file/punupomeluxeje.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/lekaz.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/29934117570.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/13110506638.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520a92f1245---mefag.pdfIn PDF document text
    • http://geose.ru/userfiles/file/nevej.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/86793530570.pdfIn PDF document text
    • https://tipresentoio.it/images/file/lesomuvopasomaxasopegebux.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/penabogidetagitidej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=whack+your+boss+free+unblockedPDF 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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10824 bytes
SHA-256: 191c090da199d9124c4446141706e14999c8b926ac581fbc37916ef4073478e4
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 14576 bytes
SHA-256: 5804d865394c43fbeeeb4ffb033466a00ffde0115d112bc61473d56ca26e3b41
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1