Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81e0c5c9f619640…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 12:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5795ef6f637ee5ce2999218d60d4c79b SHA-1: 283aab2a4b9b62ceb2135189051aa4a656c17b83 SHA-256: f81e0c5c9f6196409525740aa38f11f413e9abf9f440856cdb457b782c3c7c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gallerylingard.com/uploads/file/56672696815.pdf In PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/65352479217.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/buwijafaramukuto.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ae9366d02faf9c3baead025d9e12d065/47494606858.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/fodureroveworozesaxi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/24542323531.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f8spjaa900s8u6t5b65tnj8nbg/22153537890.pdfIn PDF document text
    • http://tzsunup.com/upload/51956696819.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258dc06060---nanupuzegovebadilibumase.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xuxebuxiremazurudurefi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417689b1997---sadilibij.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/romojogumikereja.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/38843062116.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f472a26d---19256541639.pdfIn PDF document text
    • http://zubrcup.by/files/files/82146519143.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/pizivuxetep.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9522e2c0eeae3ce30a5d9a3127533a63/12898182702.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1b313499---97822447929.pdfIn PDF document text
    • http://fructusartis.com/i/File/wapavibizavuzisugonilegix.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4813fcf792451d8a00dab4d591cd4dc/91882681983.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/femerosobesu.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/9307891342.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/givine.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/17466077264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gba+the+legend+of+zelda+the+minish+cap+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_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 11292 bytes
SHA-256: 0d800c90f22f10369ad0726559cab7dc49ebdc5ed9cdc9ad17eb55d002f15522
font_02_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 17804 bytes
SHA-256: 0b18d2ce57a812ce4b57c2ab99708954e91ac76edcf79f91a34e74cba48f7e6c

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