Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d3ff32b1917b88…

MALICIOUS

PDF

69.0 KB Created: 2021-10-05 09:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb66245bd26180e234a187f48c817ea6 SHA-1: 12e3a606e3ee75e6937231b61d535983d958e4cd SHA-256: 09d3ff32b1917b88d8abbcadc7553b94c45302f6b0e6dba2fc617c443da222b1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a malicious ML_NYX_PDF_MALICIOUS sample. It also exhibits characteristics of an image-only lure, designed to trick users into clicking a link that leads to a compromised WordPress upload storage, likely to download a second-stage payload. The presence of multiple links to disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://haitrungkim.vn/uploads/userfiles/file/gifezonikalupopulonemaru.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/5525788911.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615451e50bac1---77896645151.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/ripumulodenulisisom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477a8dad022---xotige.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/89676706365.pdfIn PDF document text
    • http://17njl.com/userfiles/files/rugorobuz.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bataxuvigumobilubo.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/gajawazefupego.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/tubenanumutizud.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/63072051008.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8289bb924b9c24d0884efeb8d43a0654/89638930372.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/11785522067.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16158db26c94c8---piwudoken.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/puzebavelopanofusegobogof.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/zerak.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34387307700.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/26668189974.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/13050153252.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/lisuba.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/majabaxewivudemax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=line+integral+example+problems+with+solutionsPDF 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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 14128 bytes
SHA-256: 5c685db8d49dd1586889c2b368f31eb80d6156c2e0def363da9b768f71b0fe87
font_01_sfnt_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 11084 bytes
SHA-256: d7edc6e712ed22e0be377051da038da3bf285d8bcd9f5edc5b1ebd8ac64c478e
font_02_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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