Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d206711f9cff82…

MALICIOUS

PDF

102.7 KB Created: 2021-08-01 20:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbeae4b833c66c57e35efffc3bf62a85 SHA-1: 0369a22e47cc84476417af7944dab53cc1147f85 SHA-256: 66d206711f9cff82ec4a2e85490bbb420c6564dd9599a5f55f258983f0eec6ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through compromised WordPress sites to other PDF files, likely as part of a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://archism.ru/uplcv?utm_term=how+to+play+gardenscapes+on+pc PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a050e434---97182139558.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb623a851c---povipazimiwofabi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/bc45a7dd5d73fce815dc97384abdf7b8/guxisajele.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b1ecb7f9a8d52b0bf4d6af354a81a85d/bidimixigageninebimalokiv.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/2c2202ee9c37bc327388b3d7cc0a2e81/69582777721.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210623045603.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0d3b17d872cd2bcdf4a73270f3d68b14/70383106722.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e3c6bb53---98971523266.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745e47afc4---bobajuxetex.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/savawevebelugo.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/78544846126.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/gavenadikaxi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/14327928711.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160818d9a6b34f---63854595982.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/23125748701.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/33452145354.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/37561156724.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/60742362414.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4f0d0b770878a9ca8574d23b487f196f/warafizo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ada76491---28689401162.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d380a38d28f---sineberozovisakerademizut.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c782074895a96e972e1bb71cfbd2728d/47733899921.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39b2ac53a---pilatututepuxukavuvufoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 18520 bytes
SHA-256: 7052ac91912a87454312607d7b98b4a336dd55df03d7832b4b0e3fbe9554c8e4
font_01_sfnt_off000143f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F4 10788 bytes
SHA-256: d580c3726d9b9fa96b7082e43d63743548db331b948d2e7f49edeca69a370a5e
font_02_sfnt_off00015cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000174e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E2 16400 bytes
SHA-256: 2ae397d99514789c7f65022df69bf0ebd901840e48a009639baedc4fd238ed12

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