Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a849f1318723ed…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 07:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b31f699a9df1b5c3f2c9c64deb2e375 SHA-1: fcb09904de2edfbf310ffa2878fb1a3985fe684c SHA-256: 03a849f1318723ed0a00dba71ad1382a1506122025250ebf5fc162805ad86955
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to press Win+R or paste a command, a common tactic to bypass macro restrictions and execute arbitrary code. This suggests the PDF is designed to lure the user into running a malicious command, likely to download and execute a second-stage payload from one of the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xofotenagobavivonib.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613baba18531b---fijufamez.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/wifap.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/terufikum.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6eb61cc40---48184214916.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dawokimurupiwudatexepup.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nazugudebanaxabowozuref.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/55659133594.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/55058058136.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613028fa4b415---51921837460.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/robevoxaxinoteniwom.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/99231327087.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/27629786601.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/18359523110.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/73347617051.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dameperogavuvomapezuw.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917020750962.pdfIn PDF document text
    • https://lesura.net/userfiles/file/83232099339.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f895f52262---30115661760.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lutitakutem.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6a58a096---10740857880.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/44266898147.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/33266535178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+take+a+screenshot+with+motorolaPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 17940 bytes
SHA-256: e0f35ed0ee8c2e4f341afa941e56a6f3ee3bf57998aa2dbe2543fd8762579a69
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10664 bytes
SHA-256: fc472a6fa02631719fc4269f9ce3d39184cf0829df8145a9c288cb3af1dba36b
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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