Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a463ea180d664…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 12:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 920c4fd378e0c9bc0656c2bcb8cb9ee7 SHA-1: c06a46dea7666dd0a40e84e1786b61d5342beb3c SHA-256: 031a463ea180d664198c5c6d4ea46e9bf8e449f6f0c536c4254a49fb1c14a096
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=bsc+zoology+practical+book+pdf PDF link annotation
    • http://ruoumoc.com/upload/files/27527732844.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e44d4f0e0c97844474cce0f137115771/31860831005.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/xebokugituranitinozojik.pdfIn PDF document text
    • http://canoeing.by/pics/files/22242351495.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/nesotevow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/560f6ad022a68ebe5501db503bcc6916/60357934266.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/28850329814.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kulamuzebivupawuromatijox.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/61089344851.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106062001191385.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/vif87rugdnn960re48jtr5gssi/sudesemim.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/baligamibimimoni.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/55933162818.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/49439179239.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161148ce324e50---64531772384.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b96613834295012d886e7cfe58fcd9e/73405780017.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/dokavigexijakuxiginili.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/toputijul.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/21672268061.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5221d5f5c---58289369393.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/96655626001.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fobisoxedamevatufow.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e7iu9eoqhur5ikpc28bels2th2/70142248355.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k3iipmjbqd6r5t7enoq4co10b7/liwusugavomukule.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96174812377.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422a3666e8---26920438904.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ae07eabe---joroxoxugifoj.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/xeninosafupalanivenav.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_off0000bc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC90 11016 bytes
SHA-256: ed09715d606abd28c950c9aa6ac567faff9c07466dc98cf3cf86af5993b57f55
font_01_sfnt_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 16176 bytes
SHA-256: 07a0df71abb439cf602081936a2bfd6dd1ccfcbffccb6e8f61c7b869b824d61a
font_02_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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