Malicious PDF — malware analysis report

Static analysis result for SHA-256 3059cab31d561aff…

MALICIOUS

PDF

91.7 KB Created: 2021-08-07 04:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9bb37e6027be746203a4aae199d2d14 SHA-1: 5cdd0b17a9b12889cc5252a73c3b610d29bc8d01 SHA-256: 3059cab31d561affc25f89e1016a73f5ef6c345e79b22975efb9c897c9b52656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities or leading to further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://thietbidienmanhcuong.com/upload/files/kesugudexuzafej.pdf In PDF document text
    • http://vienhung.com/webroot/img/files/wezupipowizorigekosefip.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb8de6970c---35163500570.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5uedv2ibbf8t1tlrqqjep05bt0/vuronevixupudowuvenuxuru.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zunibobuzapolakoxikopox.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kavuzineme.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fifesag.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/69fd1504e96f8b14124f9e2dfb7cd419/55762322466.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085567cad797---segijejababodefu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b9359edf---40854365405.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/98609489175.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869af2ad9cf---87837870917.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210719_0C722455E429A154.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8eb15a7fdfa2a4481b74aaefd08b01d6/mofupid.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5790315286---jawoxadufadewizofan.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb2ec1e86---11797379515.pdfIn PDF document text
    • https://pellevah.com/upload/files/23329026012.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/45067223470.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/kaken.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/nejaporopifirusizadig.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7srqggneqo458obrs5c2pb8o23/63240896674.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ab7bd3d1---4094110397.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb817825---15119960351.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4587f8d---9820049538.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bda47dfca---65135562723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=microstructure+of+aluminum+alloys+pdfPDF 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_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10988 bytes
SHA-256: abdd2171d365885cb22db79db4dfad446815e2eeb29bca087c891edaceb508df
font_01_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 17432 bytes
SHA-256: d1c5084f3213ecfee7af6d01c1dd7caecc9b38bb59feb5b2296ccca7d70834f2