Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b2d95165190280…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 12:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44e0e6dece09fdc9431c5be11b932491 SHA-1: 18669ea2b3f437819bfd774c80e9ccf66fc2b577 SHA-256: 52b2d95165190280cbf2ed21b83748a9ffc1e064e73cbfce3c22602d4d3cf1fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e8a8d1c5---jigijosetewuvofotunujugaz.pdf In PDF document text
    • http://www.flamanville-76.fr/upload/file/86690579500.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/23948177499.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/levupoxiwezexig.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/064f78dd1d67a29fb6dd86d26904225b/zokanazeranekulot.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/87050315114.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/22429409220.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/muwabutisipanezatokux.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/69e95b787d7001faeb76591e3d7d8ad3/66506946257.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/19a4406513176bb4264dd0c57f130a4c/18678006863.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/itvlmphnrpbahbuu5lla4cesil/12027339909.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e9e46650d---fafominokito.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/pisowelonatijopupetigima.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tipipedotu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/gobizubobiganadakumamut.pdfIn PDF document text
    • https://manenshop.com/upload/files/99178572013.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/92404485173.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/60449143892.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d819f084---getadajekanogosu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/77d72ec3164210454b7a1f0c82821a4e/42009685673.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/37012302060.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7571e8435e---59387426471.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76058040---zumetubajape.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/21272302998.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/73590321819.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/74070593204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=why+do+you+want+this+job+answers+for+interviewPDF 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_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11036 bytes
SHA-256: aac88999e23c082d73651f3e4d7b44105f857bdd87013e68d6e205813eeaddb5
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 18768 bytes
SHA-256: 5b0b385ea8c0f7604ebe8b7fff529974300d43999c79dc78c586f5beaff70e39
font_02_sfnt_off00014b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1