Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d03753594131f5e…

MALICIOUS

PDF

103.6 KB Created: 2021-07-16 22:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab6d8615d194e957ce883d4370d225aa SHA-1: 13aa3e15c1fb03dadab1ed2c1e6022b19d93375f SHA-256: 9d03753594131f5eeab34b40e9c0f4c5534a9ec917a0bb142580b62fd0182234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites, suggesting an attempt to host and distribute malicious content under the guise of a free download. The presence of embedded URLs and link farms points towards an attack pattern focused on redirecting users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bc1b85fd---17259119260.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eeb6a1765---zibejevofavamowomanaxum.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/73352692604.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/64662830172.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/386a30d5e32b7c8c0fd03314af3572a4/79061750044.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zukukiratawerutosos.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160752761abf22---3369221410.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jefugovonasefunavapo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941ee7af34e---49013894156.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/42052014865.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/23170458624.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c2b448de170d668462a280e8d53885db/97908876986.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u3qdmb8ptor34rtm4b1edpn3d3/peron.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed03df29d---32938795714.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/761ccdddd94caa2892c5ce01d3566864/77975121354.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/xavosubop.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608792c8a9d9d---2427630463.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/kakejemujinisukabolasete.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6316b3169007641c1ea91ad152af40b8/14917339192.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb086b049---tedisawaxodomurilifageb.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/gozirepujavubakuleb.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/20fi4elnc7kdaai5qmdibm6btr/58925219702.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sevituviboreto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wing+of+fire+pdf+free+downloadPDF 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_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 17104 bytes
SHA-256: cac9f30bab82c9d3e644429a008fb43f940ada4e178eebacfc40a8f7a3948d51
font_01_sfnt_off0001617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17993 10484 bytes
SHA-256: 86c0ff5a2f90ee65d54530dd8cd87a52c736dda5cc8d9d143e3e5d559b154abb

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