Malicious PDF — malware analysis report

Static analysis result for SHA-256 656169c7897e5f4d…

MALICIOUS

PDF

101.2 KB Created: 2021-06-28 04:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82357943c8f75c9cc1553c073410c7c6 SHA-1: 2bdacd9b89839c6de9e96da7c549290b4c412d13 SHA-256: 656169c7897e5f4d15c44135611849c59220b2d37dce208af6b8aa6f6f2f18ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 https://crysiq.ru/uplcv?utm_term=healing+of+the+soul+scriptures
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c8f38184d8a5d07619d0dfca90eaa098/polexajevozogejabokolozet.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/90e7694d75184684f812a94e7744e89b/47445256238.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2232cb2a686171bc29c70f3c03591fa9/3093420231.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/16c6a8b546f4d536b063f7172114758c/49626760512.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4vaj7rgo1nvvvte6fnq9b8ocig/21217838774.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd09f0990d---74273326064.pdf
    • http://i-dron.cz/data/file/lewinisozitexufekilu.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607168384bb12---87027547418.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d82fb46d05c---wital.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4bf03ec5dfe2cea445bf696ac166489f/93886093460.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587fe8f0c8---19598526291.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16098c56f80fc1---86885213252.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/aeb697d763f23c11ec8f2c08d325fd6e/90663548427.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0892af9c---mawuravekuriredudi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/657ef5e378cd43aed94a3a4835e2ffd0/68937366029.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/12191338195.pdf
    • http://netmutum.com/userfiles/file/22885659884.pdf
    • http://boxethai38.comupload/file/19162516656.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/81933934838.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e21978c59---xezudiso.pdf
    • https://aldurra.ly/images-editeur/img/file/kapawusikeno.pdf
    • http://bularz-auto.pl/images/userfiles/file/22745491899.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ripuzi.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bdcb15799---60943736749.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 16792 bytes
font_01_sfnt_off00012460.bin
4454076da35e7369318c03528f33f90c8cfbb20e00143ab0091e2721172bd976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 17256 bytes
font_02_sfnt_off000151ec.bin
25df919774967e71094a87131d38ccd41a31339872caf04eb5786b79bed95ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151EC 10852 bytes
font_03_sfnt_off00016add.bin
61dfbaf9176e75d6e7e8194af576b2afc487046208b9047dd852756082b37659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 17548 bytes

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