Malicious PDF — malware analysis report

Static analysis result for SHA-256 b115e5459b834a6f…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70df1346327e4c1f45c2f80e3fa91be9 SHA-1: 246d797ba77b96a46184a03f733e7974feedb8ef SHA-256: b115e5459b834a6f8a7975b373d5672731f415b8fcc9b28f5f40d2780091189b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c132f4f780bcf8585911b204a708c623/45148870835.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/47307602618.pdf
    • http://energo-winstal.pl/userfiles/file/7657200301.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/gedefubojakapusomogomedi.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0709741160---90571317233.pdf
    • http://hani-bee.com/userfiles/files/75800875633.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e439c470---fafilubetuki.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1fd945fe009e1326278d129ab48c2420/pefadafu.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3091b6b367---39407884624.pdf
    • https://pathakpharma.in/singhania/downloads/file/41911238341.pdf
    • http://akwarella.pl/user_uploads/file/futixidunifewukomumaxowi.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/154eq9q662fjjb4trmud7as6gp/70034125200.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e1d9c824---5302595278.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9f3c1e5928895d2e522c99ad9055d3a3/karoso.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/923ef8912c1f9524cdf172ed37d31d05/88874879097.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d01d600dcfa---36739586396.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a75bc421408---11687307917.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3b196481---gosijuk.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1d1d8d89ccde6172a6682b1486623506/55691744331.pdf
    • http://bong-dem-long.org/upload/editor/files/32867049988.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50023fe5e---sobemutisisudabe.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/58kc2i3obdab10jpf0toltj1o6/24891220246.pdf
    • http://www.heksan.com.pl/file/zomowiniwevalul.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b25cae74---91241947461.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/kamifes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=altered+level+of+consciousness+pathophysiology
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c6.bin
3099df75b5286d7491da67026ecf0ef971783b5aa721a7b6c07f23e97d46111f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 11160 bytes
font_01_sfnt_off000113a9.bin
a05a7273169ad7fae364b575ae13ed042f1e62ddedd0af80846238d124b7eaed
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16888 bytes
font_02_sfnt_off00013f9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9F 16792 bytes