Malicious PDF — malware analysis report

Static analysis result for SHA-256 9476f58fde242f10…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 19:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a987699794b599b5e5d3577b5ab8629 SHA-1: 70485164a0f3c80212c973224b6c61136522b1b0 SHA-256: 9476f58fde242f1040bf4baf4f3ffdeccb5c9e3705c027d04093de65dc8baddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://ketchas.ru/uplcv?utm_term=emory+primary+care PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/58995463218.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/refafamusuzejepofasol.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c471d5c601---15731516953.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe6b3d0d0---25785738731.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45ca3e406e47fd38c28d48df28040610/tisajosixifigebug.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/65701732230.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210607_192939.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ced2bcf063e---toxevubeguropopijowusowu.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/zugilunatukugumazegomazar.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/14453624897.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/sivizubolunet.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210725093358323.pdfIn PDF document text
    • https://allianztc.ro/files/file/gewenekixefurosov.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hrstuoteqlhlrvi7roj3a3f098/67621258485.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/vufexoxugidubimitoxeba.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/30197412383.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/zovufumemetubenoposeduma.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a007bbb70f0e7dc0f149a49704284d1a/72182950502.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/42599864513.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a35874e10---bememigufesomexoror.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6bmdd7veqegnikjs28317on9n/39763748348.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0nekh09cffkjn0ppmj8jgt4017/27465663317.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e5085ac328b3e1ffbaece612c700f1f8/pudumusogiwewezupipodezev.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vemunutizaz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/38122ff403f57782a2c166068b7eae5e/mukeduwodirojufopedut.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fibel.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 17560 bytes
SHA-256: 00f89ccd42a27e28cd9c3cac6dd3d0718b01048ff3398450bc08ee60f88ed68a
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10216 bytes
SHA-256: c456639340c73d4b9bdd2f9c679ed8f834061de73d48f4ffdc3fea17c70f80d4

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