Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce98ddf5cdb9977…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 05:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7aebbc443bac87646df910830cddd175 SHA-1: a97ba2eda190a984c78461f2d1b589e9021bfaa5 SHA-256: bce98ddf5cdb99774f87d9821bc802949780ccc0fedb9bf0aa6a1580b0b90ccc
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ladna.pl/user_images/file/64879740415.pdf In PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/baduxafilubopig.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/32852771545.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xuwukivotalozokaxis.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17862970917.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/miburugojefirad.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/5862829985.pdfIn PDF document text
    • http://foxadv.net/file/fiwonijug.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/gijimejaguvidiladij.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/robudumi.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jufokejoje.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kafubonigurikenavekizenad.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86e23993d---99240980903.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135894b206ea---47521196701.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3546acbb465560b84e381817596eef28/wirekusojemomufixotag.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/wifiwuviri.pdfIn PDF document text
    • http://wych123.com/upload/files/37945019278.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/borexotiwatalegajesuxova.pdfIn PDF document text
    • http://azizolace.cz/images/file/18854104002.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/19392980625.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/56912413624.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/matebetibikirobivufo.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/rirujoxisej.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/94800230135.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lamureda.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/36436808698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=things+that+begin+with+the+letter+ePDF 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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10456 bytes
SHA-256: 8022faa54e82e6c0287a705c67302968e4727842d8ff28d83d90aecd2dbffe65
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 17964 bytes
SHA-256: 53cb0972d86e9877b06fae16dfc433643092f5e83467185ec5bb19752268c09e

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