Malicious PDF — malware analysis report

Static analysis result for SHA-256 84674f10a238e476…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 11:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77f1619027b8078b539ae85164912429 SHA-1: 094cbdffe3c81c5470d81598a82847cca6cc8d7e SHA-256: 84674f10a238e476e3301ed118c3e1a4dc205d47c73ffd24348a298f13504dd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=speaking+naturally+pdf+free+download PDF link annotation
    • https://unchiulmihai.ro/files/fckeditor/file/totibawulesokilagajo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/jupogifadutumabaged.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bea5c74d6---37551632979.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc1cc15ec---xidojetapubenejazuz.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/42032994780.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zunegekedibumod.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fe6dad45---76637623485.pdfIn PDF document text
    • http://arablift.net/userfiles/file/76505248116.pdfIn PDF document text
    • http://limoride.net/gallery/file/zagowuzodezaxubogifuzanuv.pdfIn PDF document text
    • http://expresskaliski.info/file/23032036870.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/83276369259.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/17133056954.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210515080421.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/66862355234.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/62162361147.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0b057904---ganakilivevowa.pdfIn PDF document text
    • http://asfalon.com/__files/file/memipigiporelagonav.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/wujajanuripiwoximuwa.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/8462128705.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/fujedidilet.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/sizeru.pdfIn PDF document text
    • https://artbynela.com/uploads/file/bosusitipapas.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/37244339467.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/kesazagimufepukurutodapeg.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7e62dbcb8f7e38e8c767705ddf3baef3/67766910523.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 18808 bytes
SHA-256: 3faa04d7bdf88346bddd3a5de16d92dbaf6b22a0be3202880b44b47107badf17
font_01_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 10972 bytes
SHA-256: f01891ae7d00e31e5fa43811dbdfae1e1286c922ea62ddf6d6fcb0e9954a8373

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