Malicious PDF — malware analysis report

Static analysis result for SHA-256 2134afa7a3e12702…

MALICIOUS

PDF

83.0 KB Created: 2021-07-06 11:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0e5524d10b9766047c6970d9cba6c72f SHA-1: b87ca4fc1fe08bdddcf86ca98420a2307425b268 SHA-256: 2134afa7a3e127026fe7697dea76f18bf4e59f5ad538dc69277c521b828a3084
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several URLs were extracted, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca56d1b0ed---rowelufuvujakowamer.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/99778819531.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/069b6528968cf5df4070da62cf962711/55358461816.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nmn765nu0farc266b6t3h9huf7/59182988251.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/4459114913.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9f3a2600e6d3a9a16583dec039c4e65c/40249998985.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/56428471317.pdfIn PDF document text
    • http://unseretochter.ch/images/file/42405389008.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81567222b5---ronirupadojilasetido.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68c287e43---riwop.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/87d05e81120768d66c5ab6f21a60726b/wivemegezozalaliwexudal.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609911b2728c9---vajuru.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f47323e50ad8b6ac1311d4fae445ffb9/fubolotobupeda.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/givejad.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/68532653297.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608034638a76a---23263230965.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3202550bc---jukukekivafotugafi.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/99948487022.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/96974378868.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8s82j82u3r93oo145m5c3502h1/11686716963.pdfIn PDF document text
    • http://unsersohn.ch/images/file/puloxafefinarabuxetagor.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/89352548791.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/38203592066.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093f780a1531---xupakaworovam.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rulazefadowigazad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=floating+oil+sealPDF 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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 10160 bytes
SHA-256: f942da547491f6065f8152035b7b518394edaf9fc86262eb1f8730fbdaa0716a
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 18532 bytes
SHA-256: ac30eb1f9eb87d662d4423569ffbddf9d0f5856f9cadafba031bfea8f733b840

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