Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb94163b8eda8b26…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 00:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d55145224711f94e0f5028d91283df0e SHA-1: d5924860695d026297c14bfa51499eeb7079eff9 SHA-256: eb94163b8eda8b26e5f6c56c6ad39b78ed7107a0d01d6fa7998ba2acb802fb75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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://inwebjor.ru/uplcv?utm_term=download+nfs+most+wanted+mod+apk PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2dlko6s94b3e3akqeje84jrkpu/84716012614.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/59213624156.pdfIn PDF document text
    • http://stylekd.ru/files/17914761010.pdfIn PDF document text
    • http://adveotec.com/img/file/bigixoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079abe4c5603---gimiwalubunevaru.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4uvqc3kmuqjgnt48ubh8h2qkvc/97438773717.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/a2bvm0a9o6k5f3kjhef6uiti7g/bakogevad.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/laxuwetasugodedevekawajid.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28da0424a---28879721109.pdfIn PDF document text
    • http://gyobel.it/public/file/8822292838.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13900532591.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/jirikezutegufi.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gazokoxijedikorilufoti.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v0rp5aoivqiivjni2j4mr8io72/77592550912.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ff0843f6---52177448191.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec3f7af0a---pewelirefufogukewofumuxu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/motabijonog.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rezewipozejasekosan.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/22665361534.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ac7059161fa62d1193f92a959f5cbd8a/xijenulekemepoxezokanode.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/rigerisusekalaxerexexal.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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 17784 bytes
SHA-256: 3a912c023e8e939a98810c67a10de91de099ae36a189e956bda056f5e9269fc9
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 10648 bytes
SHA-256: 9626f4edef12747a93f16d1ec44d64baac2b980e9170bd3d347f82aedd84bfbd

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