Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a1d931425de40c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 15:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 230621dab74219fcac7402d5f350ef0c SHA-1: 7793490bdf3e3abf235fc0804aa37b58ff062dd4 SHA-256: 90a1d931425de40cb274646c36ed8190105311768a19d9203cb0e9b5cb41230a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://wastran.ru/uplcv?utm_term=convert+adobe+3d+pdf+to+step', indicates a lure related to file conversion, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=convert+adobe+3d+pdf+to+step PDF link annotation
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0809/ed14864ae07103275d48d7ffb17e63f1.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210829195332.pdfIn PDF document text
    • http://186086.com/upload/files/kizojasedivizomararipu.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/kogukalonowixuxosidi.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/betemupuropedugelokujotap.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2621bf17---69407135658.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/4437654435.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vuk2526rfcsb3mu9d4u19g4s7p/giwesorepapojuwod.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c150ef5e---bajofivavaxomosapivixura.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/ragaw.pdfIn PDF document text
    • https://fultoys.com/userfiles/76209843539.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2daed4e670---nijajutobowowewibom.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/86925687888.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/87877795078.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/40720895468.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sisafuzudep.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160732b49401e7---27591999845.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/vafowulog.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3c48cf4b059f6d5d9221ec021521cfce/96516105905.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/movusesaperupetu.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lividunekogunifofugizajud.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oqt990ct1i3ekqd239hsosu19t/difidatotiduronegonefa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081667e381f1---23027656171.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/53389936460.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12fbdd4f51---10376175719.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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 18212 bytes
SHA-256: 0c8c329da0b972f6da65826f63f8593080242aab4c6e9048682f418c29cb3717
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 10764 bytes
SHA-256: 2f39c0b10be4b1d54866a70a629e6035079e96697bfeca945a6a134da900891a

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