Malicious PDF — malware analysis report

Static analysis result for SHA-256 a101468b0e7f357d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 08:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d706f2615ffbc75795e268781d8476fe SHA-1: edddfe519c2068ec46178056e2bf01c03b373c57 SHA-256: a101468b0e7f357dd0db2353cd3319d7a66775f61b496dc68376fb2a5ebdf8a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. While no executable scripts were extracted, the structure and URL patterns suggest an intent to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871307753e2---venaferelomodulodisewil.pdf In PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/mumuvuvatotep.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rafedifukawuzaro.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lariwib.pdfIn PDF document text
    • http://yilip.net/userData/board/file/30463815873.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/63830808885.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f6753d83---daxawulomipigipusuza.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98a6ada6e310ca6dd8ed685d7954b9df/91992332104.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87c07997d---loxazidamulibusixerusu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/kuwekuleduxanagujaki.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f815a8f9---govikojuwozixutekum.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c202a95b6---86603111733.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609277aabe22e---viwutenuru.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d740bf086e9a35cda37593d6d8d63452/wolumakitikumepa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210830_051969B653DD6E90.pdfIn PDF document text
    • https://dcimx.com/files/kimofani.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/14373824462.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vijiretajanumesozi.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/vawimukilokunoseji.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/92355920076.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6108c70627---govowitijevalabalogiwune.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/as08cbf9c12fu9lpp5cfs2kd00/xasogerofugati.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cf69c2e0---64335761691.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e1d8932a1a85a912c7e151985275be8b/15626578293.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2627589---36372982220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mastercraft+2+gallon+air+compressor+manualPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/21217093495.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17412 bytes
SHA-256: 83873e8605d52cb27774629b1af7da0c665df595fda1f8cf0fac768e4a341093
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 11036 bytes
SHA-256: f90286f15d43c36deb21c7f6e3ecb877cfd73cf700f47e9edcf110859df3d44a