Malicious PDF — malware analysis report

Static analysis result for SHA-256 627ab462608ba9bb…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 21:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b9114bb099bba96a252868d15c775b64 SHA-1: 4852d6acec61c4d719b224d7567a572618cd5ad2 SHA-256: 627ab462608ba9bbb3be089bde300897a1cff955017f95c64db346ea522a38bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. This structure is indicative of a phishing or malware distribution campaign, where users are lured to click links that lead to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570ac1082f---51540708636.pdf In PDF document text
    • http://aggengr.com/uploads/CMS/file/66936618500.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/89011161752.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/61053795560.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d452050a650---bipesexulefutofe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a597aa24---lalelojipod.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xafozomakafuraradavedimi.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0078479cad3967ee49553d24f1559ad6/28170317616.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8f28a956---sagisukivuwakagosuber.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60ab0894a8---8903094121.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54abdff80---56040926646.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/tmdis5r2ad8f9knf2oq6a09c95/xasinowevopu.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/57599951933.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4d7695b8fdc57720982451f764ddbce1/tegiwokamodimegale.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/74437823660.pdfIn PDF document text
    • http://guowangcable.com/d/files/nimekijujuguwapir.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/zolotoxili.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/68775857817.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ibin4fc7df91ufeh678g34to71/17570491173.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/18673478313c78d7b61d721f5961128e/ginonuxix.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/894177e129bb522bc86a04692de3709b/37612577466.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/sezebetijaxiguzobapenosig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81483bd4f7---domanemuti.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508051252846975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sampling+meaning+in+statisticsPDF 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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10572 bytes
SHA-256: 524fd5a989964e8e5b396a137543964c2e6a4616b87223b906e8294e32a118b9
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 17156 bytes
SHA-256: 2e3f4eee06066fde1430a98d0ac6e8f4f52c36a2c84931c01b99890ff6c62930
font_02_sfnt_off00013dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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