Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93dbeaf6c420658…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 22:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0365fa825d98e5fa282c76c39a2667dd SHA-1: b908d5070a241ee44ed04b990870c740455cdbd9 SHA-256: d93dbeaf6c420658f1b7fbd1d1e8c2f6851ba328ff649d2ee58dc89156425d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=conclusion+linking+words PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/23737686090.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/92065746788.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80789837380.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xorezereloxiwamo.pdfIn PDF document text
    • http://kahasat.cz/data/file/radage.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/37500791069.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613095efb202d---86795830524.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407aea1ec9f---87201574089.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/84064612280.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/47984794729.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lirapujepevalotegoxugoj.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wezuziwe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f679e6c055---fozomafisukozilali.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/duvabolasititiju.pdfIn PDF document text
    • http://waypl.pl/upload/File/zexif.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/pujalatewafumulixemalij.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a0b1ee302e9e0125f1ef47a446e93ad7/gigejetipetidija.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/39017146227.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_045853.pdfIn PDF document text
    • http://someteme.com/archivos/_20210904033043.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/40011597414.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/92520161781.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10460 bytes
SHA-256: 07e8c73934e62eb00ae7c4ab18c744c71914c40fd78b1ac4d163e8e21de4b3fd
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 17472 bytes
SHA-256: dee8d48f6133a3f68a3a28e46e08462967c5f207ce219d9226895a583280c872
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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