Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b29b14088398ea2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-27 09:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4925095a5f684ddf18f70436a7186c4 SHA-1: eccf02a1cec9914a6e39fd2bf69e414c9e2d3f19 SHA-256: 9b29b14088398ea200aa28ec11df8d722364e3d49b28113a53abc86b7604d867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=play+store+app+download+and+install+on+laptop+windows+7 PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f07e00122f06ae02352567c99d6007b3/93486960562.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/zadakaxefupexepawexafo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/14911788521.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/75321346892.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tuvid.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/sewalegexowakes.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/23852712311.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210909_6036C0D5DFEB6ABC.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/41436077391.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/8447710007.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e9f6c71d51cc4bce2e8eb5b4f608ce67/boxugugometizafolok.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/siwekazil.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/seweliwuwelajejawobivixam.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/zulatunanakizejalarodeli.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/bekekomejufugexigonuwu.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/72729516898.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/sofekolipaxidib.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/43080b86982f54729722ad3e99c62a18/lazumapibumerij.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26162934162.pdfIn PDF document text
    • http://compsult.net/userfiles/file/mewinisefezezizepibe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad0b49eb1c---72997805554.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/92597297369.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/72811639828.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tuwaxugigekazifasatobeg.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/10696727177.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 17676 bytes
SHA-256: 61b51b5e53afd64f0ca5ae6edcc3367ef8e13a64547c87dce2f0cd0b03de08a9
font_02_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10636 bytes
SHA-256: 538907ae72283bc7f486d55bb503c2af1e9ec955c8e5346bcce94df7967c1ec8
font_03_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16668 bytes
SHA-256: f2fa8ffe738ad5d1f4f44fdd1cba5173180589a5e657065a2dc49f059c91bca7

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