Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b80b5ddb3f2188…

MALICIOUS

PDF

131.8 KB Created: 2021-09-03 23:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e203c4012a24c598c0103e4389d739ad SHA-1: 5bcebb08458176e6caa651dd5dcc8967ff74c06c SHA-256: 27b80b5ddb3f2188b2f693463a525e4aed56c9a92b469633eb680985b800084d
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs lures such as a 'password-protected archive' and 'remote support tool' to trick users into downloading further malicious content. It also contains numerous links to external sites, many of which appear to be compromised WordPress installations, suggesting a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=passages+2+second+edition+student+book+pdf+free PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65a69b25d---fenepuz.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/30221204214.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d548255413---51761416376.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010d2beac4f---31149210235.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123922607c5d---78216069474.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2638462d75df59ac1614a3a9c7402b72/kepedawugaperemu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6bc6755ebfa06de9bad2fa2c6687456d/sodunexujuv.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zijonaxodijesil.pdfIn PDF document text
    • http://tochalco.com/uploads/files/momigogilujupisoted.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/62849774205.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610455d8585bc---zimiduwibifa.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/noxixedi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/584e8563ed7374a28c1e768cb95355a0/pasirilesebanuw.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5ohidci4bo0oqus7utdqhv8ah1/78949222500.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7316f5b8---pajowi.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/51763043009.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c38789c13---2095897560.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/04b9b3eeef81cdb1204d552fbc4281c6/46791837313.pdfIn PDF document text
    • https://somogyplusz.hu/files/44047280062.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763be8d3a91---xifidevutizun.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab53e62716---bavaditariborer.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lozujiwasitaj.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_off00018e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E4E 11204 bytes
SHA-256: 9b542dfa07ba924d7101d386c08ac2889bcac17d38dd4168bd55b0ab1a1603fb
font_01_sfnt_off0001a854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A854 23820 bytes
SHA-256: 473908ee758458524d2bd2d0951c4cad1f3936835d373545a3333f31e11832d9
font_02_sfnt_off0001e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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