Malicious PDF — malware analysis report

Static analysis result for SHA-256 737ebc1ef207463e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-18 02:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44debc596a2930bf9b4d7917ba242b60 SHA-1: 3e9a00a499bb44c66bedb5cfbf13be7c96f2b3a4 SHA-256: 737ebc1ef207463e14aaf46a78f0f923d9712b586bbaccd5c8da53f9d4c3f5de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators supports the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://zrdb-drogbud.pl/Upload/file/rulitapurugevanidenuj.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cbbd21383---warupofegilujomep.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6d37cc125951d30117df66de94ca9151/99939649571.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/gokirekebizopefegu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d2a8a394c59c09256edb86bb24224000/tevipitolulinuwofugozepi.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/mafimemilepubuwejovoda.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ef938c90f9c4d729d9a11d5455147f88/7970703509.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/kixutemov.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16093015757b78---37306269879.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/14802835112.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa156476d17---serujonuj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/77977259031.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5d9a64460ca3ab1fab0f48a8dfe5ea06/loselagokit.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10636c2c---pizugimun.pdfIn PDF document text
    • http://fygl.net/uploads/file/162227407708.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/vuwafiboxawosok.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/pagumu.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/42672229480.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8b3837e67b68c30c5155680b76ac68cc/dofasagoka.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/87a1e07694a9d612841dbf54a87e4982/rinubesukufu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b89bcc51---72161421556.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/serunesigefeziteliwarenu.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/tisupabopunonejabo.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/jezotabusilososavoxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=women+with+big+buttockPDF 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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10612 bytes
SHA-256: 9c6a983908a5a216fe16123843c30759a7fd96eb93a25eabd4e7394b47dfbdd5
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 17056 bytes
SHA-256: 432033ef7e5828648660b78fcc7ab0b0a4b7402ffbfba6d07dd3be5940639adc
font_02_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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