Malicious PDF — malware analysis report

Static analysis result for SHA-256 c330026be0782d5a…

MALICIOUS

PDF

107.6 KB Created: 2021-09-05 13:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 582093f2985eaca31d72de91a29ac34d SHA-1: 4ea8c5b0fb75bd4ec4b04695e7f5ef7b8ea79b49 SHA-256: c330026be0782d5a92697c3c0e7410d7ebefc435481b0f4acdc5f4e00599eb8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs and links to compromised WordPress uploads and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious or compromised websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=color+schemes+art+worksheet PDF link annotation
    • http://accomplishtheimpossible.com/userfiles_ati/file/3238556774.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4846390b1bb09860af6c491e8a0c53d8/84448941877.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b7069c47---27749457377.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d424o5f93m32ik0t1kr7u5emu1/22932603131.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4a0e765e4---keninajodigifiwev.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/50505583225.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/78463110641.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/nigujov.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8023162e---7767793155.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jafan.pdfIn PDF document text
    • http://samtekelektrik.com/files/98506591661.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/4628565060.pdfIn PDF document text
    • http://www.centralperdana.com/file/14147123925.pdfIn PDF document text
    • https://actorconseil.com/files/file/vapebexufozilu.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/88385502297.pdfIn PDF document text
    • https://webmenuplus.com/images/file/38860099307.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c51a969a---metedivumidikofujaguf.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160987f43dba70---xipujutekukejasivujebo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f53b9850b---xeguperu.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/8418340682.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/fadunek.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_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 19144 bytes
SHA-256: 4717625c8f2f4c265dce7745c8b2d350c27c9d34571a0a3bf0f52952ec79a915
font_01_sfnt_off000170d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D0 10508 bytes
SHA-256: d2b1f71036c15373e87dcb472d06c1c7feb5cdc55b55aab28801d8b23c19b82a
font_02_sfnt_off000188e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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