Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d63931aeb1c5da…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 866e035f638693c0f6ca7e3268e86a9a SHA-1: 8cba271695d3a6247eb9d6ee16215874de4aa906 SHA-256: d4d63931aeb1c5dae64fc0e106e5312a0f3562f8d955a513a540ba9329554956
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/32885676484.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139684681f48---45945886202.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/bunuruki.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/27540576578.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109021101083958.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/dadelesakokoguxibal.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/metuvovolimeloluzalage.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/12829128938.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7321836---39425411294.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906012934623.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/59726777787.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/97866009590.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/nobidalovesobubejune.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/6758240797.pdfIn PDF document text
    • http://thedreams.cz/files/romuk.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/15373298157.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/penujipafivafolov.pdfPDF link annotation
    • https://cs-nippon-cp.com/mailmagazine/upload/files/xibolalanu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cs4m0p9024cfon8cs8ll6d0ai1/52447833943.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/58712081991.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/rijunutim.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/jedudarevududafa.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/livegumidaxazag.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17395654939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=happy+birthday+sarika+gifPDF 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_off0000c045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC045 17552 bytes
SHA-256: 7fa3ca1bc33e03958c20fbd023af99f48ed8911c9063d9ef06ed3ef9b33ea7b0
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10712 bytes
SHA-256: bd00497a9320af9e2740e0d9e2a39fccf3e8ef8c166f6ab5da68b9187ee9f42e
font_02_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1