Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a77f8d9a590f218…

MALICIOUS

PDF

93.8 KB Created: 2021-08-13 07:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf3a3d83813bd7cfc1f507c813b56278 SHA-1: 6436c1b298dc9e40630782c1dbc29a2bfdb8276a SHA-256: 3a77f8d9a590f218835cff83954230bee6c39465989b92c5918c6cf4b9280ae5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised or disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=when+should+you+use+a+direct+approach+to+persuade PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b165084a2066887a49756a18f2e7a41e/82531978433.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/69057209031.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/28673708078.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2c7a9add98beb7c42fc310ca028735cc/51539446982.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/kasofu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160908f8886bb6---fuxexizuxirosugojapip.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/60181573666.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/9918124481.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/36593053273.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2kaihuqidf874rjpuqevh2k8e4/68740980968.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s33qbmqs4pup57b4t6jt9k8umf/vabirikupewo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/230d3ed7d9502678d91edd2d1d00edf9/37028579194.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920711781f9---87729839247.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/70c5c60142d8a886ad57681c21e623a4/18535504839.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/77868312865.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e08ce8dd96a---dojes.pdfIn PDF document text
    • http://rideco.hu/upload/file/ziboduturuwaf.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c07bf546---75326220877.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3e4f0f30f14d6b69233cc62069d49f2b/kidapifonoredo.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/10504803687.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/nokijosoritududevaxaxajav.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e2b938d8768276c162918d968d664d0d/penoziwujexokutidiwudepa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c030039c---13938529994.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/berenife.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_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 17716 bytes
SHA-256: 10fcbab020dcfa0122c4ee6e90cca9812c41afdc8fc9cb7e6fefd9a766157144
font_01_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 10820 bytes
SHA-256: 9cad82b05912b0038f6d520434839e98659b210de77515f96e8c5ceda1513885

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