Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a03473143f9836…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 05:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27a204ea0a2e1ade6272815be0972cd0 SHA-1: 1ac26053ad117478ea1bf818429fbc91844ad9af SHA-256: c9a03473143f98366d1c7e0ac17ba11612e0ba901aa9277e474e3e4b00452d50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and compromised CMS upload links further supports this. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cailux.lu/userfiles/files/mezamefiliponibakatalenor.pdf In PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/36690788439.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/23178897617.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f6ee4650500394cca13dc595a707d65/490270660.pdfIn PDF document text
    • http://momsystem.ru/public/file/tizafatadido.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cf92eb1---44622017432.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/38013113937.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/fivudegenafuwibev.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7af7312cc25ea113d127c70fdc1b2a59/vodezibesa.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xuvifuvemoturijabexux.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/79344322726.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/devila.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2d5207c4b49a5c0309d1ff76f0271691/dirakevubofemud.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/58215548247.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/76182856039.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/poziporabun.pdfIn PDF document text
    • https://resicolor.com/upload/files/60060217011.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eabc101d2de1f846a26eb14d902fbfe/dasulugovomosune.pdfIn PDF document text
    • https://businesslife.com/content/file/28635207492.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/59444a9baaa7f8b3bc951bf1233d1108/25233324176.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f90e77f9---burepifu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/31371613427.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/8521359182.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/54389569667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=board+of+review+for+life+scoutPDF 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 17192 bytes
SHA-256: 789ab8235549e830e58e014dc384441c452b86afbba6c3b6c73a881019e40ea6
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 10668 bytes
SHA-256: 0e47a725907d71f6e504582e6598ad32683d804e8431bc74bc7b51a661479a53
font_02_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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