Malicious PDF — malware analysis report

Static analysis result for SHA-256 106e876504349270…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 18:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84950920dc679f5e5263ec9fa91f9a79 SHA-1: c1292b84e623d74dc3cb48a1cb6a932b0f852010 SHA-256: 106e87650434927068668f9980769399f064b268588d091f56bb37f36bfe6367
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/aabae35b187c278b0b9487955c79f5d0/99519753855.pdf In PDF document text
    • http://radecznica.pl/userfiles/file/97145565730.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/69615721006.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/geferalobodabir.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/76597845060.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a49060d9---wulonorobazepiteresemit.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/72547558025.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/37252335300.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/kunajisoses.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/nesifejoxana.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904052812113597.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/jevizagexepuzumisib.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i65p0erdk96c7ipppgmmq7ajr2/42212479439.pdfIn PDF document text
    • http://cpviettin.com/upload/files/61365521207.pdfIn PDF document text
    • http://merwepizza.com/upload/file/10672396392.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e916b7b4---sobuwajifulamob.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/21947174551.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4fd351ac6c4a11fe920cc23aeaf2b81a/3025851860.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/49591866704.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/78079312657.pdfIn PDF document text
    • http://kant21.com/userData/board/file/24618031502.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/15971621430.pdfIn PDF document text
    • https://superpart.com/files/57346433814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cheat+clash+of+clans+mod+apkPDF 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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 10816 bytes
SHA-256: f6ef1e41e9a6cd679357b9d4a0d12bdc05a93ef9cbde4c908f7c811ca3a209e9
font_02_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 15168 bytes
SHA-256: 9320bbe607d0273c24237df5051b42fae2f4fcacdb064e6f9c9a271aec86125a

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