Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8fdb62f4d69868…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 18:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0b45ff6a585abb8bcb34a4e02bc8049 SHA-1: 9214029707637db7405cb0b699d266bc5d8633ce SHA-256: 3d8fdb62f4d698685def7615e9784b6725d66440cc2a4e8addd5516d604aad36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or directing users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate structure for link distribution. ClamAV detection and ML classification further support its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=lego+justice+league+attack+of+the+legion+of+doom+full+movie PDF link annotation
    • http://bulk-supplies.com/userfiles/files/viduxubesomosos.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138980932930---52740207913.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/gudekosijifevusu.pdfIn PDF document text
    • https://haidangpc.com/contents/files/3757702703.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/mutiwematute.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/5104454538.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/90491325807.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39ffbcf14---358138680.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/6766620568.pdfIn PDF document text
    • http://www.bash.cl/media/file/gifuwuro.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15982687858.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruxavopapijudozewus.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/gekozekalaka.pdfIn PDF document text
    • https://phnews.ro/files/file/mojunipovuwerepiful.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/53674166693.pdfIn PDF document text
    • https://datajournonepal.org/files/gimagufadogubojagazodaj.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/badisufufib.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/01iploc5vhtr7f7jfk1jscaglt/63276358459.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/5031723135.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81094493703.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/41525576264.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/dumesepebo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/15563681653.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/57625566455.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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 17276 bytes
SHA-256: 553fae359f3d2e2a87d345754f17744057aad24667373bc9139d65a201e52e64
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11168 bytes
SHA-256: 57536e7caae0cc7285a8ab2ac373e7fc9ecaa90e59c01b2e90429bd07ef8b44a