Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd03962abdd51a76…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31208539032fc3891d48b3ed5853f919 SHA-1: f615be2c2c78c900cb1fa81c074a022bb4dcb63b SHA-256: dd03962abdd51a76964a233a71ce9e4dc6e1721ac5a2f00116f350cadf55ffcd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file exhibits characteristics of a phishing lure, including a malformed exploit stream and an image-only design intended to trick users into clicking external links. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or harvest credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lrsinc.co/userfiles/file/85679441408.pdf In PDF document text
    • https://duvanco.be/docs/files/safumisixugodatef.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/8733549457.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/65751504132.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/47748284657.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/felalamobanuripamejaxo.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109041359141133.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ad1a63db271c23471719f0f305ef008d/84248545684.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lotapes.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/80653356122.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/leradoganonofapene.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/37804073880.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/xotilebebagero.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/os3jtl7ab6ot4hdtra6flalbvt/vojesimugabifalaz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff50c40e8e---41377840080.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fokakorev.pdfIn PDF document text
    • http://origo.ws/userfiles/file/38239349120.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/87279763365.pdfIn PDF document text
    • http://emannsltd.com/userfiles/92334052880.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/14122348873.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260d0dc73d---97319583440.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/deroxatopum.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/muzineb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nfs+hot+pursuit+remastered+androidPDF 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_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 10792 bytes
SHA-256: 0518340d205d4b725e2b99c4f0f43f36c7d3e85a2f4ee17b60ea70d1acad63ba
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 13916 bytes
SHA-256: d3f90c37ac82a05582734f48addb060cb4a5610c00f3c85a800ecde0a463e6f4
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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