Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd0567d6421e3a6…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 20:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe4d47633427b8cfdd5c383976a0c0ed SHA-1: dda12a980250861472546cd0f084e84824bb227c SHA-256: 1dd0567d6421e3a63ccdf0a57bc39e29789ab9664ecba56fd63b1b5e1ea94440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pistant.ru/uplcv?utm_term=pivotal+certified+professional+spring+developer+exam+pdf PDF link annotation
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a9n5l6ohvmlsq2lp1h8eo29n5t/petosuseze.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9d108086912ee160e5da344487f47b60/96816793809.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/sujabowifarafowobidova.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0b1a92003---10402227424.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d4ktrtlo10i3d5lq20cj9p3tuf/45419002652.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d4eb3cac---nawafivokutikadam.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/34738074727.pdfIn PDF document text
    • http://chongros.com/userData/board/file/23160163237.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t7uci7e178md7n0kn4h7ooao90/desopuxumepakimogoba.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/12501179493.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jesigoxupikupepim.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607382fbacf46---fuwibogapivap.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e1rmffoigjguh2ql9939kplb28/28054312794.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607141b585f04---rajup.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9ko5bc5p9b2dif0f3mfp0jnjg4/95939854430.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sebovivijanuxakunopamaru.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63ea25ab3---88391569192.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9u9pjnmofptv3svtp29oumq73r/piwemodekede.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f5ef23f1---69134710117.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fumuzexixezidaxemovoj.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/zetuzisitisamin.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/56131395130.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefccae9955---98966147706.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607225c78bb5f---motilivavibatawel.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_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 17620 bytes
SHA-256: a4439c53b30e878fea41a746772f7f7df64c088ac72d1fd0baf1dfe729358714
font_01_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 11132 bytes
SHA-256: a02d073014151c48f0f5f7b98a9ed73d156136d6923b945f5815070d42b5c158

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