Malicious PDF — malware analysis report

Static analysis result for SHA-256 589aececb9f9c874…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 06:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e2c35d69bd556b3013539b4d97f8437 SHA-1: 1a6e30f2ac3d5e6166f8a089ce63501e450b6348 SHA-256: 589aececb9f9c874aa100f95ce63e3f5c5b121a76a25f681bfaa712abc93fdbe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be associated with compromised WordPress sites or disposable hosting. The presence of multiple PDF link farm heuristics strongly suggests the document's purpose is to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://faxik.online/ckfinder/userfiles/files/62783503860.pdf In PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec2205c8b---4732903273.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cbspeefte6b0okr34mf34p4i78/zumuxawa.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/segorulupopamolasitupor.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6ccac951---87469105958.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/namazojatikuli.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883ca3945b---1340034141.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/feligozenunowoxux.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/waxizapubafarunopewozod.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/26524051737.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bd3d94fb2c74fa9e68de5a2619ee921/39237013114.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9b6e41924---buvuvumuzinubakenamine.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/sogurenenokasifan.pdfIn PDF document text
    • https://avflash.nl/upload/files/58915110928.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/67481031308.pdfIn PDF document text
    • https://digireg.si/upload/woparezewanelerativ.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/75c2a5352f9a4f6fa33720af36a16a1f/96202078837.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/r1vrtftgip1tdm8chufercjfam/41119724424.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xagiwonutedazekago.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r8u54th2ll5prg7rbrk4jbi0t2/75706292466.pdfIn PDF document text
    • http://fullx.net/files/59530707395.pdfIn PDF document text
    • http://proxima-design.cz/files/file/xujizi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a126dd0dadf---mezuzususifiluko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rewind+ac+motor+pdfPDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16644 bytes
SHA-256: 60b57a49b38488c97df31fa4819dd56a5ee88fd5779835420b12ab71056dc652
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 10700 bytes
SHA-256: f577140bdbe7370e7489e965a7214d1499c8cf71068fe679adc8642494c38bc7