Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f7f3b5a745e6e8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 22:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b43a5633effb3d5a9d4d956fd11a1d1 SHA-1: 817f70d07b69c849e4e87679f13a1d71e94d682d SHA-256: b2f7f3b5a745e6e8c07e03a644b767de0ad4595d86646954ddde7f309b751311
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt an archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://pistant.ru/uplcv?utm_term=gta+5+mobile+for+android+and+ios PDF link annotation
    • https://vanrun-it.nl/userfiles/files/66820131534.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5359fd07---12107376277.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitigepodamitibemofixuro.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4967d37d58aabb6b25e3b7281475b4bc/rubet.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/83514494545.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba531a589---lebepim.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/66077214435.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/fefikofeta.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc980469c---77151723031.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366010c4520---nedamunagemupixe.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/nojujivujapiwejuwuluwidin.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141cacdb87ef---sejufozojujipipugakap.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/4158811627.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/31559258710.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/db3b60332053247ef2818e02b6a3b9ba/78080134543.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210914053226.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/4848838132.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/68146864960.pdfIn PDF document text
    • http://pmke.cz/pictures/files/giteniguj.pdfIn PDF document text
    • http://splogservice.ru/content/files/kufumesodek.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jewagizovisavinibejemuxad.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/mozufudatavipuwik.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/finosarolikafojajegef.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/ropejudo.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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 10828 bytes
SHA-256: 533aed2f76f0b948598fb6ad20dd892e8a92f02d1c0c8bfedd9e9f150985700e
font_01_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 17200 bytes
SHA-256: 3ec9c1c015f4bb7e41ccff1db8b9599ca58e0058afe8d1bf241a1d685229323a
font_02_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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