Malicious PDF — malware analysis report

Static analysis result for SHA-256 5257041a4c402c72…

MALICIOUS

PDF

96.4 KB Created: 2021-08-15 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 819521894fc4f776b6c05757d5eda36c SHA-1: 8adc0adb008ba68b79665e155d778a8b6c711af3 SHA-256: 5257041a4c402c72f2c763d4a595bd178a17f64921136dcd4c2aca6d1650ced5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics points towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/011af73b8911766c2026aecf733c4bdd/revupejegalobazusafifosuv.pdf In PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/perasanabit.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sosudumuvolawojinunebe.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dikok.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/jesitusexuxur.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef46cd863---87884965504.pdfIn PDF document text
    • http://intergeored.com/upload/File/89947428403.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/18623536256.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160852990b9e11---didexuvogizatubaxome.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a73122c5---38797099860.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fuxafitigado.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a245b228f3b---kitujorefu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef84d66b73---jejokarixarifawusabupug.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/65337158165.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/memimodidupaviwinek.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7k369a7misq1cv6t065j7me833/xinegikikimapenunoj.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bstqarhff1r2e5apijhs9qr8jp/59646861976.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb23cda5aab33d9bf260d58436503e73/82413925498.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/30442325828.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/daberesivonofekin.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/54760530033.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210517/210517054240710030k3dxgu18j56n.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/36960878200.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gibuwavaxova.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e7cb134db---lunozidavudekopu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/romajujofividoxofinulujul.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77065785368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=super+mario+world+rom+hacks+no+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 17940 bytes
SHA-256: 7130206f40aed43f06d78c84d80878d1b87230984c7b8b8b8199ec5d661b6f23
font_02_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 11032 bytes
SHA-256: f1160ab11f8f4391819eda3cc47dea7b2172df1affd803eee076e66707d93f38
font_03_sfnt_off00015cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF6 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd