Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a0a10cd5c4d41…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 22:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 663a410d8167755ff8523d3e238cd037 SHA-1: 8077084e13507a8a85272d6b9428c40fbabd1b36 SHA-256: 123a0a10cd5c4d416861db8d82963de8111504ad2c047b0e3d9e0bcd1892e0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress uploads. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cuacuongiare.vn/upload/files/wuzisesopagobexawuguw.pdf In PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/motebalonojenaforebav.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/robudexeravude.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/85661942399.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/59764375872.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cd2fd4c0428df04003a4e4919cae940e/fitemipukipu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fd7cb1a245d89dec73152b17b504a01a/46010902947.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/33671805592.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/30661326406.pdfIn PDF document text
    • http://ezibra.pl/upload//file/70422116427.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a0c7525c7---70950659267.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec39fb0bd7---60046622474.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116bee29b12b---zirajifigajetofamulanid.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/79442557953.pdfIn PDF document text
    • http://amajyuku.com/files/files/52618963606.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/80727190877.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/74462433515.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/4209215727.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6544e81d0---wubizusu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ugcgpfll5cpamffml3nql3h31h/87835725086.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077724680012---29545815065.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40895889281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=selen+lebensmittel+tabelle+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 18428 bytes
SHA-256: 991063d13913028c55c95f7a81876f013a638dbd8fe3157b1eefe6ba7f6142a3
font_02_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10652 bytes
SHA-256: 3fc47c748290805bf636238935f439886bff763bf30a62eb30c0546654cb6afa

Open this report in the interactive analyzer, or submit your own file for analysis.