Malicious PDF — malware analysis report

Static analysis result for SHA-256 84761c50c98f781f…

MALICIOUS

PDF

133.2 KB Created: 2021-07-31 16:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 05c8df39d2b62d33f3742ac9a5bb5349 SHA-1: b39cce0f7dd2c187decdd5ef043c041e0d7ab804 SHA-256: 84761c50c98f781f22969e2a4cbd2bc64a11df405c49f1802148107bd2de14a1
156 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to exploit kits. The structure suggests a link farm designed to evade detection by distributing links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nomylo.ru/uplcv?utm_term=list+the+16+west+african+countries+and+their+capital PDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/buradomilewupot.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wozuduluz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246a8e3f16---20721476036.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5adc42a31551dc87552d09edb3a71e49/64127475511.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770913a80b6---21130071177.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5t4nk6bs4qu0mq1lebnfrr6qt7/79338999887.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c9e19c96bd3e7fafe3781ffe53f417cf/vinawelokesotabubin.pdfIn PDF document text
    • https://123natura.com/stockages/files/74604474814.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f590755c89f---kavegosekuge.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7193027adb---tuzizemi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/50775072174.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m5v6eqgerh1em0b40v3oa6sd4q/kilixifagiw.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bcd820ddc3e9df1274f940520fb53193/86003259137.pdfIn PDF document text
    • http://119pump.net/d/files/vofofisezigo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4861307c66---80388086089.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/fibajufed.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/53156150064.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/pugonu.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/lajarajol.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/77140950756.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d14c27bc---laxejiked.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e90dd45e---pewetomilisabirebe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3498c0133---jolutitowizux.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nizanegoto.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f9c18183---zurobegifokiv.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_off0001a13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A13D 19728 bytes
SHA-256: 61ae3c45bdfce1a8dbb3009e502de6af6944317e7ddc34585d78804f3de20567
font_01_sfnt_off0001d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC48 11080 bytes
SHA-256: 1550184bd8121df36c567616b341cd741b50377e9c555916b55ba7cde55e63f0

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