Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c9aaf510c3d9b7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 10:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e53a2220a6d638b8eba3da1193ad92c4 SHA-1: 7bd95b1b0dcb2b93fafbcc3dec57d397a4ca4607 SHA-256: 56c9aaf510c3d9b7c2d6cf89482f9cb346c0062ecd6c32beebe234833916c347
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs support its use as a lure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dermatologie-chamonix.com/userfiles/file/bexakoduj.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/92628207993.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdfIn PDF document text
    • http://minhanh.com/files/35784450986.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30148087369.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b543b3e01e0---40701436467.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/4690582043.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/porogapitefupazuxaviviwo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/7601308130.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/23683602939.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/47317687020.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbfb8a6b8a---ledogolapif.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nq0m9rbtkj9jl733004qosuls3/telibijosisegis.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722552193b7---megakov.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pawug.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/371200137.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608732601ed08---segunema.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071370a40e6a---46552246972.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/77687157892.pdfIn PDF document text
    • http://hydrem.ru/images/file/zikigowifapakefazori.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6rlhjdtd13h5o4fam61ovpf45j/pufaxopi.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/17202817098.pdfIn PDF document text
    • https://sunridgecorp.com/uploads//files/202108050945133565.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525034627_z7k7nz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=elasticity+calculations+pdfPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 10580 bytes
SHA-256: b7abfed70b2953be68dba4175addeaefe8e9c81ee1dc073b322d7977b730990d
font_01_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 18916 bytes
SHA-256: 3ad8e0c59ba566bdf7dfc8f5778890dae4906dbbe3c7a4850f3ac75edcdd1136
font_02_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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