Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca0510c57032abb…

MALICIOUS

PDF

94.9 KB Created: 2021-07-16 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa5dcf2e524a7c62223732f603103bf6 SHA-1: 49936300dc3ccaee9586b2df76cf7024884a0f77 SHA-256: dca0510c57032abb866ca89d0586487af4942ec1e0a6584f83d20e8f413c4ae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bd978e2cc2b96a15074927b40854e57/bivakuzuxetulizojajot.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v4bb93gljoqtnr2udmj99r4b1s/73469672985.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcb389e67---13427845154.pdf
    • http://aarogyamedico.com/userfiles/file/58469724664.pdf
    • http://antwerp-reefer-tournament.be/argt/files/kiratinonesusumodopimeba.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad351020d---nunopubuz.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760ccf70235---nozav.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ce51292a12091e458636be5ab5e6842b/53412785487.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfbe723d---nivuzuludesekiduses.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8ap9ki9kimdi8o7kise15q5qbe/bamejazivuriv.pdf
    • https://matskaren.se/anvandarbilder/203/files/gekikovu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3032cb516---43399851035.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/547905aaa50efb91b3e091dcd623e3b9/38037068207.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c024c78f04---29891220246.pdf
    • http://hrudolf.com/userfiles/zenepetusabe.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rqhubgnnaeoto7mqc79i2qm54v/87261376750.pdf
    • http://elsekmont.eu/userfiles/file/dugopanotagat.pdf
    • https://actorconseil.com/files/file/18506097813.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/betexofer.pdf
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720e72d9d1b---soxemagetokamagogunelebe.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e6975f2---xogojumabiginuj.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8587c8d3c9972a681047dd2b86877026/jirameposu.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tegerigajanodeju.pdf
    • http://antifftech.com/uploadfile/file///2021050400151937.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cdd43cbd---tobazogexob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sql+substring+until+character
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
font_01_sfnt_off0001259f.bin
ed62f13a9b023e896e05466e2ecd821785ad2dd6fe35cb690791d55364355e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 18420 bytes
font_02_sfnt_off00015589.bin
7a69a0ea641987d46423960dc7b770baa8b0f0d9116f607b7bdfb5df69fff461
pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 10848 bytes