Malicious PDF — malware analysis report

Static analysis result for SHA-256 df16aa8e1528bce3…

MALICIOUS

PDF

85.9 KB Created: 2021-07-05 10:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 374c03251e57af052a06bdee85cfb45f SHA-1: 7c458e63e0bf6797bb0136ab8505c1d81b0a4262 SHA-256: df16aa8e1528bce32b690342aff2819fae41bb1a3438313346cc2d0aa2f4387e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://pc75.net/upfiles/file/1624109021.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/55631410519.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/tilavimusaw.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q9gamk7ptes5ss6j9u38i79hus/lutesurudebukegewabunop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88b1a6458---keratusijojudi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/gulumagiwu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607785a4817ec---48646140208.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/65dc2c9cdd0afade4e4c658a50b16c83/gimogoxeromutufavuso.pdfIn PDF document text
    • http://aqcons.vn/upload/files/68115252545.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950da490f6---pewipatufovivinosawajib.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/76417346914.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/imhuaomavbcekmpts45qiqqnn0/49866061655.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/torimogebij.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/82642180074.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/553224eee6658da8438422aa1f77a152/lozawumoxatodujumoxuxido.pdfIn PDF document text
    • http://waypl.pl/upload/File/xuzimopudadugilaxulujafit.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/pomaku.pdfIn PDF document text
    • http://yuha.be/_files/file/28836745072.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3hafrm0apep4gv6cqrpcr1oip2/kidobelefowixixobikaxur.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/takaw.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/63509196162.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/5509773273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kipping+chest+to+bar+pull+upsPDF 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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10884 bytes
SHA-256: 6deca8c97e7d4a102f0ca2774e616ef0c9de6d81a235904f5b6179ec89747f56
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16480 bytes
SHA-256: 2e2e3f15cd6510bc63313d26b12fbc4aa161aa00f906f9558694fc3bb0201c0c

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