Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bec1d0e859ca340…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 08:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a8db120ec554878bbf0d790eac9fe5e3 SHA-1: 123a41a6dd26805554eb4a1a7458fef7cf66e856 SHA-256: 9bec1d0e859ca340c59e261c7d2e6bc03694e10e264c098ed724b25c272e1b41
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amatnieks.com/pictures/image/69015381366.pdf In PDF document text
    • http://akiisushi.com/uploads/files/45756355650.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vadedog.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zujovepisav.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0cd62b8587ed0fbd214bd577fe2cb734/97756340654.pdfIn PDF document text
    • https://aneri12.eu/res/file/xifejomida.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/61192481923.pdfIn PDF document text
    • http://bptramptour.pl/files/file/forotowudarotafir.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/44559859426.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/55922512360.pdfIn PDF document text
    • https://diphong.com/uploads/98906678146.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/83147222422.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811d08b7d68---2693360959.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/nakanip.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc406238b2---19927122001.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/zejadefoxemevud.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/b13793028911b6984c9822c42415c544/lapasomufojidove.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u0vcgbg73sn1k8v9vgbnr0v7iv/39974488400.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/japaripiwoxa.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/89906367554.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/83957578460.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/89767255410.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3ce6v5l6m0v1t4gd9a7kvedl5/jajizovovufidirasabopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=where+does+oil+come+from+worksheetPDF 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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 16564 bytes
SHA-256: d4aed350ebab8e1c937c5872660eaedf27ced7837802c5bf5cf6ec76cef89ccf
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 10644 bytes
SHA-256: d5f6aa971adb9b77379bdcfe66c49d71d5f2fa8212006c024d5dfa5cfdbf1b09

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