Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a8f0d646a4d6e8…

MALICIOUS

PDF

99.1 KB Created: 2021-07-01 00:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7c9989fec2d3962f734caab9d6655e6f SHA-1: 8050f8d1d7978646e23da7e1a7c09e1dc001771e SHA-256: d7a8f0d646a4d6e8d3b886852017b7652b8d926c345c41fed238d8efeead8b2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://tl-systems.hu/files/files/88899148809.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295a0ba0f1dbd21e76a55dffc82de380/36574200219.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08fc38fe4---wigilisekuzerukugifev.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b64780f23b51286ab827a31c8219c5c9/56049329745.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/kotavoxasawuwumuge.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/1789142990.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/80363194723.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972c4451931---tevapotefawewilezakaduna.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/28394333365.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/98124717591.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/26349723449.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ragolijuvitulega.pdfIn PDF document text
    • https://protrialse.eu/files/files/57929390557.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6c03f188---tivos.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/kivemobatavaxov.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607679d367e2d---74534115855.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acc14f0d428---91026915808.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/32125818523.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5cadfe2d---25956699421.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86822344d5---jexun.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2c9ab65d---76014743500.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/53b0c284e0563edd1581b3dc909742c9/zigusemidotesabixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=8th+maths+textbook+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16960 bytes
SHA-256: d52fba4ee34d3688b8a9ab596f6e09c55d3e31e779b5900a1a0c4919e0438f8d
font_01_sfnt_off00013698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA9 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_03_sfnt_off0001644f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644F 10816 bytes
SHA-256: 601bccac9ba648a0fc579c9b7d1722ecbc4011aee52e22ccddce77f92eb905fc

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