Malicious PDF — malware analysis report

Static analysis result for SHA-256 963f2aeebf542e86…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 17:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f8b65d4c37502cec7fd166d47ba6a60 SHA-1: e31a4d7e9697e8f20390c85637c545fb871ad41d SHA-256: 963f2aeebf542e8629d20fa5374c52d0cc6aaeeeb71bbb2851fcf4ef3e6b0a2d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS upload storage. The document body is heavily obfuscated and unreadable, but the presence of numerous embedded URLs, many hosted on potentially compromised WordPress sites, suggests an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4b04bda75fecb58c4fec1e253eb59f9/13419821637.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609741b24d038---dobiritizidaganiripenikim.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cbc5751200c306ecc208ccedb35421e9/79044154835.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a6014e0a1f43adf0f9d9097c53d90909/tetuxejiwen.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/lavekegetarifip.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160726b8c8f7af---zotanirazadoraperiwe.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/26046111209.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/1824406513.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da7c322ff1c---dazonijaruxoxukijowurip.pdfIn PDF document text
    • http://ombs.ru/uploads/files/25577254827.pdfIn PDF document text
    • http://unseretochter.com/images/file/76771089343.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210812_41AA6DDD0CE1279D.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6068de878ef610b0451cf94463a32948/41420011617.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8969ab801---zaromoxilirubitujiruriban.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4328e9d32---86930255789.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a464aa47a0---sekasedidifunatakulim.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/zegofavurogefomej.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bedomadavozur.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa5321818---tuguzoriwurakinafimab.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/mebuwatire.pdfIn PDF document text
    • https://patc.fr/imagesfile/feginegepuletuda.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/duwovariwuluxetude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anest+iwata+w101+manualPDF link annotation
    • 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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10388 bytes
SHA-256: 4ce96c0503e34e573d8ddd43d2d57cc03a1e35760d70dd7845b59057334f1662
font_02_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 18204 bytes
SHA-256: 1ddbaf4c97f12e166f5dab8c45f230a84c51c03a48a2a9e10bb1e870ce4f7ad4

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