Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f42d2b19132d85…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 20:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 897391947cdabe496057e2b95552f7b3 SHA-1: 62537a6e3085bce8242e316726fbe3eac5e39698 SHA-256: 02f42d2b19132d85112b2e4cec6deed2f74ea3e9ddb8aa39044194afd757d5fe
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan distribution attempt. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary attack vector appears to be luring users via a malicious attachment to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=doubles+minus+one+worksheets PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc5313070---90471539842.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/pesorifugojuw.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/llvl8cbf4sdeesp2hvqvclo7n4/27468134631.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/43231802336.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e290724f08ec2b7500e5d6c0aec62977/55309686043.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83174400441.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/xosamovotanevoniniwuko.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8d80511a58c7cf25608f5504c83928c3/33586918925.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a542e05a---betuxelogatifip.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/12213917068.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/bawawisamu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7k1i54qh3n3co7k9ale969ka93/84875731671.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/vosekotuva.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/sobapupebinojenakemi.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/70023537132.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160779b3e16b81---26678797804.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/87691663599.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/loliwuxokujozovozoz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4709b76fb1---tusovavexugixesagiledexa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3f709d03858bb3a246c12466da6e1b58/52972088907.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/74256010994.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/39887094780.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/daveminifi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2rjftbprdkf665kp9qc8pm5tr0/kujenijejolube.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zaxafogegi.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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 17472 bytes
SHA-256: 75180904b2abaa10ad2734ab261bd0acc06318b998156f21fd5469423e509cfd
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10628 bytes
SHA-256: 6a205ec86f8cae2acc1ceac0ad5570bf9d399fa7a57e5f632bfb99f789dad4c6
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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