Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63f41c2d87e88b2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 19:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c841b464c8dc123f7dd2aac4277e1c52 SHA-1: 6154cb2a02a84036a21de2fa8d3f88ee13319471 SHA-256: e63f41c2d87e88b26cd7677e6df6e785286d6680c069b3230ab449013f0fad51
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous PDF links on disposable hosting and compromised CMS upload storage further supports its role in distributing malicious content or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://podlahypilat.cz/admin/file/12593786488.pdf In PDF document text
    • http://svaz-podnikani.cz/files/file/40459312273.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2812d7a843cd2fd38e63fe608faa553e/tumogelavadab.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kutopolifajujemotesivup.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/93257922397.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e02361995a09bf9687abda8ab6daf238/liroresuxixewip.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/tasanajeditileruzisi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/14a29c0df7b477f9394fec4e984b7923/sudife.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4591a3a2b4f4d45c454dbcaa233ed188/36589323063.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f13143defa0---sadatenofowuwekox.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/34836318010.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/fosoxugitolefub.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/26047270336.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607546069d15c---85503452745.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c53d4937e---20860047214.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/30900920099.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tiretozosabu.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/38577740801.pdfIn PDF document text
    • https://ms01bet.net/contents//files/90795135062.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7b4dddfb3477e99d0e5665666ae96271/zuzugokimawodulijopade.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xiwekoxebuvumakofesida.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/merasax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clinical+anatomy+keith+moore+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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10952 bytes
SHA-256: 78166078aa605be765add00c8ee15e37e467f03c19c7d31eee8be4cedbcb20c5
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16888 bytes
SHA-256: 9de04d4adc0334f06055d873db0023aef6e71929255f3b251564fbc5ea2b4343
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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