Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff381eb8dbc919be…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 23:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dfd1eb6cc518034599d2eaffb3ce5cd SHA-1: 02980a3206760162eb9a0613e46cfb7cae8bd6cf SHA-256: ff381eb8dbc919be3e15974df7058d123b64c29758a697081d9ef8c18492384a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan payload. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=linear+and+quadratic+regression+worksheet+pdf PDF link annotation
    • http://slstudio.it/userfiles/files/62808816651.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/nowivepuzexosaraj.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/72881024993.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2256b737---55681798009.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/94548719984.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b587121dce9da61eb5dd65c490fbd412/4660861564.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/nafikuxirevonegipaxirevi.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xifemud.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214f6b88fb---91973025149.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/344b48cf461e21a4e54358862999f223/55267356020.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/27953785514.pdfIn PDF document text
    • http://weingut-suppan.at/files/zefevivanasenefuteza.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb7a137e---sofovisuk.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3qqv1lg107vas6kropqavc4r64/xugetolitasejugepikaxeja.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5j8fcre2kc1nr0hbtg8541sol/67711949697.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f076ee7bf4---pefafonemekuwotejaletupa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5e61945676e63226b436248f1285af12/vabolixukikujuxekezunuje.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ledmrumm8t6vk858n090vjd1k2/83379819594.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/19748715305.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/81431484085.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/wafalesojusiro.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb3a51fb8b686548ebc6f9f62fa921d2/bekezetijevej.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/sumanuzogiredutopavujebar.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/40818030491.pdfIn PDF document text
    • http://vhz.cz/user-files/biwive.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_off0000c22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22B 16876 bytes
SHA-256: cbf460130c7100ba0a95c304c9c4d0ac8314ed84eb01b39f53dc4eddb5a841e5
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 11232 bytes
SHA-256: 94efaab6dfa5db0a8641f368a7aa4e8e8a6d7915029caa55af9437671e50a42a

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