Malicious PDF — malware analysis report

Static analysis result for SHA-256 f215406ca1acd19d…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 22:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c5e1fe59e8cd8d5030b8ae8b00dbbc4 SHA-1: 32cc33fc33627f6ed2419e3e8ddda3c15ac75568 SHA-256: f215406ca1acd19da4f77c9e9251a45fdf4c8f6f62fc40c0e45561b408585cd2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many of which appear to be hosted on compromised CMS upload directories. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/59ee5af618e21cc219616f17a0daba8b/69978935219.pdf In PDF document text
    • http://lixupeng.com/uploads/files/13619078108.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834336cb2fc---zunazusagovetorena.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea16a52e77---9104618802.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/xipida.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dn3e8qkda685ucq37unoc0h3s8/37309556768.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687dd21e8---kujokikex.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/3250113513.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607966578b860---zirivapejikazona.pdfIn PDF document text
    • https://melz-feu.ru/upload/1131673536.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6123e859f45efdd6d1590f6b251be910/70807046496.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/15960049894.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/82695213750.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98832c6d9b---fesevexup.pdfIn PDF document text
    • https://activepymes.com/pub/file/dogubomifolow.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905222227145797.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161211d6370fe7---83727233769.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/pozifivob.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8230c576---69450450877.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/kewamurokokojidotapejol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wolfgang+borchert+das+brot+pdfPDF 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_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 10940 bytes
SHA-256: 1b3cdcbc4803d5c16500d4c6f822169ab2d07cd03311ee91853618e8f4b1b0d7
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 21352 bytes
SHA-256: ac4122bbda679a7f7c1a01d55e6076c5d69e8bf4f610742a7e61b60fae05cc0a
font_02_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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