Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39a9930252d4287…

MALICIOUS

PDF

75.5 KB Created: 2021-09-25 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfda856901a1c68eecd29286f9cbf9f1 SHA-1: fb55178103592c046b2a6bfeb7170e0bb57ee5f7 SHA-256: e39a9930252d428701e43366dd6fe2cf2314f2ae616d0c3793a2cc772f2e3da7
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links and the overall detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=juicy+mp3+music+download+app PDF link annotation
    • https://tonere.shop/app/webroot/files/userfiles/files/wijofutojujuwit.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/79550575525.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/24262668458.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/gojak.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/305331526eef1bb3508e6e3705d57964/pudopexesafinirex.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9e3e944e6253140fafd3cb883df3cd1b/luwelukopuvunu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/92690270490.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/69279062330.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/62hp86e7ataqmveokkapanp37j/zawabini.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210916192154_fpar14.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/funet.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149f9b7498f0---supanewekulugokote.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/51824112351.pdfIn PDF document text
    • http://topflexsports.com/uploads/jitagipalijixovuwufod.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/pezometizenarusul.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/8866994729.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuzuxigawevinovukapifimu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/xobukapojivutisuti.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3db3643f7---40346993237.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bilakowebiximino.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/liwutiwubikabigixabogamor.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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 19364 bytes
SHA-256: 6bf3f8aef69d788da5823cc1210d2e4ad6aaec98357986b8573faf39be1b473f
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10808 bytes
SHA-256: 69b294768aaa23145dc968fb71e7b242fcf9897f514aee1dea126dffa5f2b455
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1