Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4fb7f73ecc8a00…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 13:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db2e028286affc4a02e3a2918e70e8be SHA-1: 6b62171a7fc2335e02633df084da9e735409fc9d SHA-256: 1a4fb7f73ecc8a003ca9058a84846a951291bd3ae3d96c75a268dae72c9a7e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious distribution. The presence of external URIs and link farm characteristics indicates a likely phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://shipsupply.ru/userfiles/files/fawatiwofofo.pdf In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nemelekuxusevuri.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///87959676550.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/82120570303.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6evrgr137sfttgh3idrl3ghbcm/60137909646.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/20783556660.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/12398529986.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087cc0a46---78680067380.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/sipunawobagijubuxudedu.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/sugasodibebidenev.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/bakedilaneji.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jodibigetufusu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/26388716345.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/96073851607.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/84819239148.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/49780175022.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/8857901363.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/sedikanuw.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/52a8ea6d8561c2d625d9d903261e8553/zopijifumokifopevewix.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/fuxodagamuta.pdfIn PDF document text
    • https://theipbuzz.com/images/file/96472229513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=overdrive+shadow+ninja+revengePDF 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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 10692 bytes
SHA-256: 36d722a56a323812a6f2be97f2c5ed049ffe70874b7d359033b826fa8bb2ee4f
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 19552 bytes
SHA-256: eac889ee745436446c4af4c0086ee6146ff02148f0bb75130f80208ecf14f2a2
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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