Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5561a05add803e9…

MALICIOUS

PDF

97.1 KB Created: 2021-09-07 02:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b90c340724aa3ca9e9322d3a6ac9618 SHA-1: 01dcbb000fd11abc498ae9b6b824dee9ad8a9ae9 SHA-256: a5561a05add803e9a30e7e45841ac6934008d96fcce2ea78330734dce294c3ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=prueba+t+pareada+pdf PDF link annotation
    • http://portableandcool.com/files/files/65082773312.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26759eddb---josogasuniwukunekugilog.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d41be49f5d4981286bc5d1c34ff43970/mudida.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6449562357---23131883231.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa26c8ba8d---vorademurafagiwapupadupe.pdfIn PDF document text
    • https://cristalensi.com/public/File/11314658605.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/junidajokovovowebe.pdfIn PDF document text
    • http://poorclarescork.ie/images/6323614042.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/dozaxudomitoze.pdfIn PDF document text
    • https://drlanda.hu/user/file/zizitulegup.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210721_043514_5461.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/25142001519.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/juvukawunikuxeketudado.pdfIn PDF document text
    • https://defaico.com/d/files/33045300081.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/94562764307.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210728_F1BF9B6F014A9496.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8bac8dfb---57582808691.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/95414681613.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ghbhn1jau4o5j71kfn2et61o69/kawiworir.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109fcc1bd3b9---22776863798.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081651ccd50e---18860724847.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/90612137531.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9d8a047de0a4396aeb05b55bae72585f/45320586044.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79a970d0a5fe1edc3f6f098cf0422e01/8148394126.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/79305143763.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/bcb702d1525dd41fc879dfd800d05885/jetagu.pdfIn 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_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10204 bytes
SHA-256: 06458845ec4afe8be9c7c3cf5ab27cf751b8f9334e79f0d826bfbd32258f6d01
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 21920 bytes
SHA-256: fecb48349c405f0cbaa3551b5ee63a572098bd15a0b3564ff99af8851a2b65f0

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