Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b51f5992ef1da4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 03:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e050999d943a5655a60de7676b6d03e3 SHA-1: 84ad09a6699490c0d5407e3a2130504104b8c041 SHA-256: 16b51f5992ef1da46e86fb96a17a4dae350a3a34530397ddcc1b84532fc33577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting domains. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests an attempt to redirect users to phishing or malware-hosting sites, aligning with a Spearphishing Attachment attack pattern.

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0022e27b9220c5c9bd30221707caaa79/52082279972.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8251e8c80---wadamobikutoxebi.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/87663684455.pdfIn PDF document text
    • http://happy-land.hu/editor_up/berijib.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/93326463505.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/bulafiwotebajas.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/48454993135.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/krpa10luvlajefiee6q1pio2o6/32306701706.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/7659059925.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/60366707167.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/27388521255.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/65a73097af021886340b2bda608a9143/55887232498.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/naduzaleneriwawufojakaw.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • https://iohrp.org/f_files/files/93137848428.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/veritag.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9546fc4e---wogetate.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tu2j6q2stkss7frdblec6eib4n/radibagupimeto.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d470d5b85a7---zarojizero.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68048c0916---81557540995.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/97d2904995839ffbb4613aa191d44c60/rumitoverorinoperola.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d3db9c71a83---gujezugafekaxelukikaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=articles+exercises+intermediate+pdf+with+answersPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 18320 bytes
SHA-256: b31b89938249ea26a4cf891820bed4df61e4619247d91ccbcf8a25f8d251974c
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 10932 bytes
SHA-256: 6607278d75975bab664db98a3abbb4c3971c3177ef81f48ad8bc0539bf9d0ee8

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