Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bc46b64f18e209…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 01:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7fd2d326abe6621f6301c6f054eb47e SHA-1: 843d71769c00b08498f001bc0f238275f9ca56da SHA-256: c8bc46b64f18e209df45269ab17502615f815642067e6ad2612570eb135f551e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the final destination, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://livestocktool.com/d/files/43425207944.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1fce591291dcfc2c355f823d7fc0ef13/fapiletobojenab.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zawaru.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fa556cdd---dubapoxufuluwodazaxofaxid.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607662387da35---12482435875.pdfIn PDF document text
    • http://hanleyresources.com/images/38053863540.pdfIn PDF document text
    • http://gptools.net/userfiles/file/rezasoj.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8af96f3a4e42e5a825438920fcd8d42a/wimovaxinudovegobeve.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddf20c7a549244d4ecc572611a3c55f2/benadasetulumomep.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3ac16c656---jijikiwatipuw.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610431ea644a8---fudegebe.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/movusijizazegalapitij.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m1e38sgvt2cva959guensiekfe/1561761035.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/rejuluni.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/49031603061.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/3604223371.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sibodiwadagewagegemus.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf92662f74---54942301739.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/64288410990.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/wisusisumedukozimim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tecknet+bluetooth+mouse+bm308+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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 11100 bytes
SHA-256: 710a54fbbaca4b89e400e1ab6c369b0e8ce292138e72f23c133d7be74b679ca1
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 18172 bytes
SHA-256: 3672464967456c0f9db7ac8a347d9a9c7a15c6cc2a64464b9a14941991ca8df5

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