Malicious PDF — malware analysis report

Static analysis result for SHA-256 864111fa99836b63…

MALICIOUS

PDF

144.9 KB Created: 2021-09-04 01:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2c3c49a0d5e6cf64ee8218792a5414a SHA-1: 13a1ccc304c4b0d1be75d89d5593e85316d03cd4 SHA-256: 864111fa99836b63f4a0c04e0f16a212256b0453ac4d9831cb9d772138a11e9e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://queure.ru/uplcv?utm_term=thrive+casting+crowns+sheet+music+pdf PDF link annotation
    • http://heureka-cz.eu/files/sobewenokewalifusi.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/97970835720.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/23089624770.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/repek.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/88260810521.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/9471719272.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978880293ce---maromumepijusep.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/16536638835.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210819211651269.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1ddf0862---57076123991.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcf23fcee---kujuwuz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3de4be7cfda9ae0a275308a5ed8fb65d/92762120232.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/didededoxe.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/38891535370.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/56647437581.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/sovebibilum.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/bafurasepadipumu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b843febf0b9---betaxirasa.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/76702746499.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/65633642140.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/peputabuxenapatetujuzat.pdfIn PDF document text
    • http://ktcz.eu/files/files/gumafisizoxawipix.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/22981414442.pdfIn PDF document text
    • 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_off0001ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6C3 11236 bytes
SHA-256: 0098c3b273e7bc9d992bf79741c66647c3a18891a479c0e0663bc619068093d1
font_02_sfnt_off000200d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200D0 20108 bytes
SHA-256: cdc1ec1958b4d1ef202fd5c0995795f09090c3d2777f9f548e2d034d7302c351

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