Malicious PDF — malware analysis report

Static analysis result for SHA-256 0938e7184c801fed…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 12:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3239dc26f53e0e09dc9029e00374b44b SHA-1: 578203b74504c86d980276eae7ce26cd9ee19567 SHA-256: 0938e7184c801fed0ba41cf1f3052f78158545ebcd3bcf5b35072efa91f3c686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures that would typically lead to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ganport.pl/userfiles/file/mulemaloku.pdf In PDF document text
    • http://premiumdrinks.eu/userfiles/22295410725.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/wunisoxopewujimakib.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/24834098937.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca3a53954---72009708344.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/20892208501.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/filisofexofosowolorox.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/44721336731.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/64899170439.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/wifoxofesinufubugowijiz.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/25373899857.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/xivete.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vipebago.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/divijepagigikukuwiwa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613341dc8b9c5---21301527871.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/bejemefija.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/tezepulepaxemolirifor.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/41146823841.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/xutadaxit.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/majewidisala.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bibulebiwudetipujifav.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/478397992462e7cf0add6205e8807879/4905819302.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/30610178068.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/11345836196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=boat+io+gamesPDF 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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 14996 bytes
SHA-256: 930d462e45f04e090b4923e721134ccdc1486190ac76d1a743a482dabb2d4412
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10252 bytes
SHA-256: 7d40309d0c084b5e3ecd25576aafec44a48895ba3defa8ff8a228b2b11af630d