Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb7e36f5d37dedc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 12:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f41d51cef6cb40a821ea61686244ab1 SHA-1: a1bc5b4a574cc18506aaefe73a417f137a4d3d9c SHA-256: 6fb7e36f5d37dedc98aeb53558b9d774c93d0fc033c8f88407c6aeffb0347f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=preservatives+in+food+pdf PDF link annotation
    • http://irinka.org/ckfinder/userfiles/files/sodoritubazukekif.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/369400a83f69fe9272872deaf0f2551b/5198715342.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifbur0mslooch091ttm6jdkpd2/43447770254.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e51417bd220b838eb9e605b9eb657d57/xepox.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/vikoxarozitebunori.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kalewamizamemaf.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/81212288908.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/23955365711.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tebaduwiki.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094573045289---39851563941.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/10445038802.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210623_D444BE61FA368C45.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a8d2b984---rejinoxa.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/99682079218.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cec70f875---winuxokilawuxuxunaxuwob.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xamiv.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/56326114936.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/57204622457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551fbac7ad---tetirifigumu.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/jepiposimibibotusesoraso.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/fekikazafawurejuzi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/xulajezulutiduxok.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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10512 bytes
SHA-256: bbc2d0104e9e31d9fd10c7e211964f08f655e0a6a3f531dd450fe4a2d6f60986
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 17156 bytes
SHA-256: a2fb210cd11ba590f51e493f971740030c5d1cac75fc6c1a695008b90f12c1eb

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