Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c60c23903c966…

MALICIOUS

PDF

82.6 KB Created: 2021-08-20 16:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b78f6d5d9a98ffef0ce208e9972e030 SHA-1: f193dfa61d6e9f78b13f2fe6fa0444352964dc66 SHA-256: 844c60c23903c9662ad1355b863de336855099064a37d5e02d56b72c88a2b4ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://rpitrade.com/ckfinder/userfiles/files/9764834885.pdf In PDF document text
    • http://superplasticizer.cn/d/files/41603145707.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/58897956068.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91acfbf50e---gigapavinoxatamufen.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27bfd2d7f5---51102957389.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/vewagofatemibiwumiduwibox.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32ba1c699---davul.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22981897526.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/f0170ufs3p1ol9ivt18kfb2fb6/51181538297.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/22852919735.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a378c682989---bebivufikeveluro.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49251643911.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o02q6pmo3kclkcl9cp0b6t3rr3/sitorodovorovip.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeddce89d2---pifexiwowawat.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r77rg41qqub1akdd1ivt836d82/topol.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/85154959046.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d917bfaa---lujaj.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac24d3738---74239764105.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/ruvitunojufopitujogu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42107880396.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb66f15df---69938347212.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/livazarakip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+confirm+an+offer+letterPDF 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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 10404 bytes
SHA-256: 1bf2a6091fa8978f1320eccf21d70372d211de41161a16f6300d8a25660548f4
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: a396a7ccd72a3abdd28f4bbb78a47aab7a6d38b0e5a84ef73f319027aebffe5b
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.