Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bac6ef65ca4a94b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c99e3ee92f880fbd7d27dc3cdb45f98 SHA-1: aba9b1f422ba9c5e69845e5b0dc30cd15ad682bc SHA-256: 1bac6ef65ca4a94b2aa9afa63218cbe55fa96acb1a05611cac639121b36041fc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple distinct hosts and the use of compromised CMS upload storage suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allseasonsart.com/uploads/fck_uploads/file/wivimamiros.pdf In PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/16862903925.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d863f53c---27274166605.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ea76195c9---14241839458.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8t3lir3h3f8pbat1pcr84p51rm/daxofanepupidatosefakupun.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/88355380455.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/vajavivujebabekarujotomuj.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090fedc8ee31---58923534607.pdfIn PDF document text
    • http://dytac.hk/userfiles/gureramujegapofidowo.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/61157941675.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/diwipupuxetekegarevuzad.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12708085335.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da272c432a---99209707746.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/5308618778.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d65ccc3a086---bumotajawinozuguxe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/14ca8569c861f85ffc7ca404cb572b8c/fuzozeluxogujabonafosini.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1b76fe3900c9b302d402c35f53139485/59625763475.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/sopuba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/68539941968.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bivefi.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/dafakerutimarujixizutis.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pamateguku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=learn+hindu+astrology+easily+pdf+downloadPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/bumefu.pdfIn PDF document text
    • 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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 11036 bytes
SHA-256: da0900209629bf1583d67192a7d2fa2474c87b764d4eba51931f0f0ac72c4bb4
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18320 bytes
SHA-256: 45f0f1ae62430902e85b95cfb63502fbe8882097089ef2234211b9979a2e5234
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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