Malicious PDF — malware analysis report

Static analysis result for SHA-256 6275943a0da6db37…

MALICIOUS

PDF

85.0 KB Created: 2021-08-17 07:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 933cd6cfb1ac22fcfdf5665ed7996d6e SHA-1: 2c300b7de37feb661f540789eef82bb79543d3e9 SHA-256: 6275943a0da6db37d5c416663a51b2bf82c8194374ef884cad8a6fdd5c41aa4c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bompentax.com/quangbasanpham/app/webroot/upload/image/files/xekezakoduvudegolekop.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ce481ed4c66ebb878a22293883352168/91521883408.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/wilaxafukoviromosim.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2a5c774c---muguximupozizabozad.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf29d71a7---wezowuxisit.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/80104261285.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/70d845d9bd85543a6f8ace646193fe8c/73744704685.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/42176376515.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88047299503.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fabizejufegaredafojot.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xekoxoniwen.pdfIn PDF document text
    • https://fototipia.hu/files/files/83927046974.pdfIn PDF document text
    • https://x-software.cz/data/file/gifumedevedibomojojejupe.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e49add7d---zanexukux.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e479f28e1d---vekogifufigegodapad.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cc87ec70d---33888383129.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2c0fd72531e329c4a78d0d573a6ba501/gavodemen.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/nuvitukimumozeja.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/26b026cb919155dcb79d3422ed1299a5/mapikimutubiwanen.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/81473635655.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e9d8015037828b1c429da9ad729a688/fokomiteva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+accountancy+project+class+12PDF link annotation
    • http://medlab.webd.pl/upload/file/jaselopozajelosolewe.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 11128 bytes
SHA-256: 3e7455fa2c382d5b540a0a08257ee907f5fa82348db0a9cf6373a869a46bca52
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 17960 bytes
SHA-256: e6ba35c7b07900fae7ffa1623d3aec9938b0165c893b0b9033fa7eb57c31405e

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