Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fe9165c729743a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 10:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e9978f57e0cd0afe451b6701cdca6e4 SHA-1: db6fb0420cc766a676c2ea759d3270dc4c8ff744 SHA-256: 01fe9165c729743ab2b98d437aaf7caf0c0814905c26ca4f81b9b85c55ed25a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests this is part of a campaign to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b96f67b1f7ca6dfe7b45654ab341a239/muvuvoja.pdf In PDF document text
    • http://luingpyrex.cz/foto/Image/file/dumojinatanadatij.pdfIn PDF document text
    • http://dytac.hk/userfiles/95183945540.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19556054ec---xuletanulajexejamu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160f28f177f6d9---jutasexexapinomaxiga.pdfIn PDF document text
    • http://hongdacable.com/d/files/kunusutor.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/akg21p8eppfmh19dbpj0qhr803/mezurawaloxi.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/xinen.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/57967054311.pdfIn PDF document text
    • http://flexicourse.cz/res/file/lawajotajuvapajajufe.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/60287348928.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/2358207141.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/lazusuwobisud.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rolotebebutezidusarabi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076907bbb72d---mesokaruwazalofetawos.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/40716892693.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210814052641.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/89484135276.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3dc5e28cc6---motefekipolozutoratapodul.pdfIn PDF document text
    • http://gibisch.org/files/files/29722105067.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/kasekenuk.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edef13ebac7---94688813186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=illinois+condominium+property+act+2019+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 18580 bytes
SHA-256: d206efa21f50c2c0d48ddfd412cc67e9dbce8ac1195cf08a45da9e5c0b2d8367
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 11408 bytes
SHA-256: 6c774de15e98e16893e9b7d49d55c2f10ae92361af49b5688dc85644a2e2833a

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