Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ec516c708a93cf…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 20:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69097a94b9b080e2441eb82fa0eec19b SHA-1: 8c02c677898195157871942dc45f7bf2ec4f1d71 SHA-256: 38ec516c708a93cf442c83c1af5760a39cf0f4ecefc7ae1aa064aaab885e3430
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, all serving other PDFs. This pattern is indicative of a phishing or malware distribution campaign, where the initial PDF acts as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://fruitssupplier.com/app/webroot/img/files/kuwamulumilojimag.pdf In PDF document text
    • http://ourpreferred.com/userfiles/files/xuleborurivozugomamit.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135077403f66---firiniwikuredosowexunujot.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/namufenugujatu.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dexisimopokotuvabavezozem.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/43289725280.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/49124207695.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/rojisunorasopibek.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/sopezadewotigarudopubaz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132788e8b4c1---zunodosexetixawebogon.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/82151384147.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd83eeef9---kibedinovop.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/lavobasipijasosagaravil.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210907095651.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kanido.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210905094706314281bdkxrbbnt8uz.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/5981120701.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/gifofutuvibobisovog.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tizemezemufawo.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/susojoj.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/ninafemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=snake+eyes+declassifiedPDF 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 10432 bytes
SHA-256: e8d15382cd248392a1250f9eeffacbc2beb7da817b474b82969a0c5632687ff5
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 17124 bytes
SHA-256: c15ce89da66218e7180d324cb2125d9be66f19deb1a11284bb26fdf1578095d1