Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb7cff3d30da26e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 11:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 767ba0553523755f68b87ecd8bfe1525 SHA-1: a67c637bca3b765f81c228e683e64d3fb3b4e470 SHA-256: 5eb7cff3d30da26e6fdcac994744f8788e3d5da865578ad6a385fc7b7d66debe
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The presence of a 'download button' heuristic further suggests a lure to download content. The primary attack pattern involves directing users to download potentially malicious files from these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://avalon-essenzen.at/userfiles/file/rinolazozimopilesotelulom.pdf In PDF document text
    • http://na3.it/misc/file/21324995168.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/51433468979.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/towojozuvoxi.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/010755517624.pdfIn PDF document text
    • https://davaocarrental.com/images/file/18712687004.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/fofiz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161343fb8a2c3a---32777592227.pdfIn PDF document text
    • http://attlas.center/userfiles/file/63200084386.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39901757302.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613269e839cf5---lusiluvalajidowejuvot.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b756b174---popepomikinanu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/89903281697.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/22653093310.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/72641998969.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/detoligibufikigu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jokud.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7415df48---50410327975.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/noliz.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/89464689033.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/98765884837.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/waripamida.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96683322287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=agneepath+2012+full+movie+download+720p+blurayPDF 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_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 17244 bytes
SHA-256: 885ca82eded57ff0ad27cb1c00241a454a3405bdf88a047de1ab6ae1772cb315
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 11608 bytes
SHA-256: f98d0b79bd371a38acd2c18344ae703ca5f0f304755de7e41f403f1beaafea7a
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1