Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c4988c2b3389a8…

MALICIOUS

PDF

74.5 KB Created: 2021-08-16 04:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 124059f1236ca593635765d32e9808a2 SHA-1: 616a93dee752b5d9587b1e0deef533ce86cfa909 SHA-256: a0c4988c2b3389a883b514f3babc0f60f958310739a1f1dbe5e14a857c6f0c30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+girl+on+the+train+300mb+dual+audio+download PDF link annotation
    • https://rpdev.org/ckfinder/userfiles/files/28823576806.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6ab9831---14008351868.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/zupofilimixevisozimamawor.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7c692cf7e53ed278a9fe941acb57d395/paxoripifede.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/36f41b3471627db7dcb807b49db81729.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/505026376.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/nusizuworawiwi.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/39053133251.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vsea72damd2t5r3sp8qrj0sgj2/raruso.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3d8926ebbdcbbe496d485c2edca67f0f/salorivoxubalabojexotamek.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d929a4b61---nubif.pdfIn PDF document text
    • http://temple.mo/userfiles/file/10566327229.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/urdisriteh9f8vcb8dtr17a7mg/6608439113.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e4ae439bdd2115e33ff4954f5b1af960/gasugew.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6bcc0b9a---jaxukinuwo.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/woforajirixofefemegaxu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64582071073.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2abb7d7ab2cfff1467431471cff3320c/kobitazafixidavonu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/40926634298.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/lokoxuvozofi.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/nivikijis.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/be9c01f0ba0c61f98e8f49962cb760b9/37400017700.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/tuxutaw.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_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 17220 bytes
SHA-256: dcc28303b3f80f1e39d56146029761cc5750b421f42a53105924f9a1578791a5
font_02_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11112 bytes
SHA-256: 110301de52fb1f61204f7b834cc1cd6349e4aad711d00cd11f3fe92511355e55