Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a8ff6548d3e05c…

MALICIOUS

PDF

92.5 KB Created: 2021-07-05 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4040b076b335eaae1cc49fcd02b45423 SHA-1: b1897d4bcd1740e75ae7a300c331f098dbf1f0c2 SHA-256: f4a8ff6548d3e05c616dc3924ced77791f4fd0b8abb03be2713d4a2312d05980
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. This pattern is indicative of a phishing or scam campaign aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ebsenglish.net/_UploadFile/Images/file/4548469453.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/1227838969.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/26246ae91e401ee212b77ecda9925f03/72802940574.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/65rt6q7sj4ani4hk9976nnpb73/jotub.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/701c7e5375fd36915e443a21f3faadcb/16787101751.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3eugi6lccf929bg1mskb0cl255/27512019007.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/k8ek55clree91fhgd2d9venlj5/bisokozufesu.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/94576626760.pdfIn PDF document text
    • https://activepymes.com/pub/file/mojuwudivesabakorure.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a323c85390---moxepuramomeruxilo.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/mepes.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8kk1eu5iqtkj4dq2o9ukr3jpvv/30335129222.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/48984fd92ae62dfb0c5f499781410365/79218202397.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d93caeadc---13369697409.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8549167---5850374043.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/sexelulejuwujobofakike.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3202419e96a9738eb84e02b05fad1bfd/defusutunodazoziwimilug.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44e4912672f32360d7ed480916564690/16352802447.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986b1b3e849---xaguwi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/52176727877.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3049fac4410f8d367e75762cba98c447/80955467686.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd6a150c0---pufirexetujedi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13d04961e0ca24b762bb45088ac29524/goziveximaruxirasuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+community+service+in+high+schoolPDF 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_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 17464 bytes
SHA-256: 2c4eaaf1f50ff3968edfe1f66b2ec2b36dd918eaf546844a7fac928678952f2d
font_01_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 10948 bytes
SHA-256: 3bc770d60e536f0d9c6a84f8cefce3dde38b116399db5581ad69d9ee2a8cfa53
font_02_sfnt_off00014c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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