Malicious PDF — malware analysis report

Static analysis result for SHA-256 9140348a2ac1fcd4…

MALICIOUS

PDF

86.8 KB Created: 2021-08-19 00:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: dcf3f4465a6a2d84405c37867f01b1a0 SHA-1: 7939d4d216ba67a9758e4c1bc98b1306d5625260 SHA-256: 9140348a2ac1fcd4d0e573b8cbd88747660d49a56cfd650576eddce23a887c38
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary goal appears to be to lure users to malicious websites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://irlanc.ru/uplcv?utm_term=how+to+make+rice+pudding+without+condensed+milk PDF link annotation
    • http://100gastro.cz/soubory/files/29618970762.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/9688400006.pdfIn PDF document text
    • http://prestopc.it/upload/file/73293212756.pdfIn PDF document text
    • https://anakmeong.com/contents//files/fapuzom.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b47cef346---kixuxabufogubojimaxomo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/19c226f621806a9adb7ba6e10179d091/xopulovenibuzaboxurig.pdfIn PDF document text
    • http://jarosi.hu/files/file/livenabuso.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7e63ce16d18b930ba026dd7ae3e600ad/47651673839.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28436057561.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/87151106508.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wosizijotaxatasizuz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc3ef843a4d968cbb34df9bf8afdebc3/80740283148.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/81447730660.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/67043679440.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d93da825d---92826274002.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e98bb0a129e12555b68f174d253e4fef/50598807975.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d2e111ba802f7239c54dfdce15e0ada1/datupiwilaxipogo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607978ce85620---moxoxekin.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vidiworupokipakagonite.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/68749152101.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/sejalidivezamugigewekuf.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/95577348882.pdfIn PDF document text
    • http://vodnik48.ru/content/file/83447797251.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/27133405858.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/13050876706.pdfIn PDF document text
    • http://flexa.cz/docs/file/4751101067.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/no9enjf7rb0d48kurab4hqic53/fixakagiruzono.pdfIn PDF document text
    • 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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 11228 bytes
SHA-256: e177b0c87787f29795f74c16735cb59aa32ca8bae060adaf89e8c4db31c20f06
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 17472 bytes
SHA-256: 2947c71335b4c7e58a47d938f66ece971012c5afd60042fc71c0898fe174b0e7

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