Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d754a8d48eda4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 06:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16570ad2eff7f9c5a6cd88b07b196bcb SHA-1: 288dc75f5db24bf1e1c95c889f60e1dc4853ebd7 SHA-256: 4f0d754a8d48eda49b6fc2cfd340578b51f61a73ef4b29abc5d08612ad87edf8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and link distribution suggest it's intended to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://waelfawzy.com/userfiles/file/ In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ef533f85ddfe7bbaad9e8a3d1e4dd2e6/14310606045.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/56165158093.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/vemurufabed.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfc778b482---27089819085.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/85875134266.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109f312de376---78391214891.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/88590641378.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/zebenisobarivetotadine.pdfIn PDF document text
    • https://dptech.vn/uploads/files/49257862299.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/68935982834.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5lt6gmb8h6603ohp008036bbp7/52914803830.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/dolajabofatobubanijabaxav.pdfIn PDF document text
    • https://tonitomov.com/picture/file/49253180574.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/17523933562.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/63570862646.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cb5b9128---rejajivu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740e0edc08d---zanuwuge.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160718b008983f---soritajidaluxoxubif.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/17132732845.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6be3e9472---57268057389.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/14260138083.pdfIn PDF document text
    • https://purefeeling8.com/data/file/90272643065.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cedab7d5271be29da588282876fb62e3/75021359334.pdfIn PDF document text
    • http://irths.com/upload_files/files/75361220355.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/2422575635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stahl+prescriber%27s+guide+6th+edition+pdf+freePDF 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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 17428 bytes
SHA-256: c092521ab17019ebc0d9c85a566172421307ed39b5d6f550359c5aa35539562f
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11416 bytes
SHA-256: b928673f6db85d61cc6c84f145f8452869f3a50d0f8f4d9ac5f4fa25f4587201
font_02_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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