Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8412e7ac008675…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 11:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 254100ffe704afada9b3ef933177a709 SHA-1: 06f3e4a8d3b7588673be9e68d6221b76ffb1bb6d SHA-256: aa8412e7ac008675a04fcd29f12f72468ea81f3719f8fade06a7ca645b9e2a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://stlnsk.ru/uploads/file/maninenuvoju.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/gisefokuz.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/91194483085.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/af65603c3166c7f0e923f50a624017b1/soworudobuvix.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vefigazaligeleliwefuv.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tukam.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8qfrm94ijt4maphil4q55smgn5/bofalinilalowa.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/78966218298.pdfIn PDF document text
    • https://songhong.info/userfiles/file/basuz.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ramamixunujubebivik.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/11793338216.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3d40422a0a98c68ae6166376a9e991ef/97238830605.pdfIn PDF document text
    • https://nasikampung.info/contents//files/fagofezukizuwurebes.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/43204856444.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/vegoful.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/tepumabixexom.pdfIn PDF document text
    • https://emmaushuis.org/pages/56431383925.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/zomixemopab.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wedelutabofuzorozuduv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612732f46629e---46271308130.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zetibe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f370f663cb3---xuwegi.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/65969139039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mettler+toledo+t70+titrator+manualPDF 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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 10508 bytes
SHA-256: fb86f4bfbb22b6ef42be40cb11b2f6c68b5989480a0889d40da468a17c10de74
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 18620 bytes
SHA-256: 227fc8aa6208e61ce6b7705fd217d179f48eeba6bb601aa07144e659ccc2975f
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.