Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0ec8f8d51518d4…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 04:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0353c320f9533508ec804953119a5707 SHA-1: d73ceb31792364d691214d69da15424054a09cc8 SHA-256: 4b0ec8f8d51518d4b1a279a3913cdfba6b8c5270aa16aed4b6349f0027f7095e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS platforms. The primary attack pattern involves luring users to click these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kd-council.com/upfile/files/11242587992.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcec7cbbf1---mugewaserokikijag.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b89777f076---7604350905.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mn35ojgcagbhrmelm7u74l4384/pudisox.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/36537531956.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91e5a1d7a6---71846868308.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/954a2e24712b4f41dccc911917958ed7/52954541405.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/folujutugurasajujominuz.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xamivegegigubarenuregaze.pdfIn PDF document text
    • http://ubest.ru/images/file/15551551709.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c46efaec---66138933131.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/67952044634.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/23298044269.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/68926535261.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/89781127450.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e0ee9228ebf32b839aa67db8b7f84fbc/97018224658.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089da8ca5a13---jetulu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/scolqjgpaego8ih1b3ksk1o554/99052796044.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc7b1ec8eb---69169583071.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/00err00j9h95qu5rbsl1khqvcd/57394487655.pdfIn PDF document text
    • https://123natura.com/stockages/files/katasariremumiraki.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9c8a5a4800caf1a5dde1926c72b6d15c/33442049907.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/motezavojixejeva.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n06ogsvicbg8vg8krrda1d09ig/35383888782.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ec3666b10b391a78bed9c77f94bcf764/70276924437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cold+war+apocalypse+mapPDF 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_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 10612 bytes
SHA-256: ba26a12dcfd99666f1f77fa914497eed5e0079fb3cc23a8e5183d0e966aa59fa
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 18064 bytes
SHA-256: ba44390a182e851ba1ab6545dc742b4bd6ff9374450a4e55ddae3a15db845831

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