Malicious PDF — malware analysis report

Static analysis result for SHA-256 af88d71417cd6b3a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 10:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a4ea961d9811324111049a3fff8468d SHA-1: 885fe2b16e9c8748f6d21e4c7180bdc395edbd96 SHA-256: af88d71417cd6b3aeb7b9f7c1d805318d325256fd60f1cb8f3f6f5a7744750bf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=aplikasi+plc+android PDF link annotation
    • https://www.weboonline.com/ckfinder/userfiles/files/leneruwuxirevozafuwoleto.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/puvagadaverevamejexagaz.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/60482622105.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/85306215808.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/17559664468.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xedefilulurojobabuga.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wonebulufebipelas.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/96493043602.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/vizuluzuxabifewizivezaf.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/83548548122.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16139f02a09fe0---xedefaxodepipupewi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/98361922787.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/47684649580.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/bifuvurenevebibuvomexe.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/24331497829.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tekenopenowejo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/82194541727.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/mumidikofadejozo.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/7946453739.pdfIn PDF document text
    • http://xenangheli.vn/public/files/418266438.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/rezegotofidivewepe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140322506ab7---46334863964.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/51688325408.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/ponupuvis.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/16319512020.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3dc48eb2---boxajikuxelage.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10352 bytes
SHA-256: 736f782de5a0d0d76dff37288a185ec63fe2c7e41ff2769e4f74dcec2a0a2d17
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 18000 bytes
SHA-256: b7a41965d1d056e391f6a96eb4300e272a10e91718b950c9f85ca13b5fd2a917

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