Malicious PDF — malware analysis report

Static analysis result for SHA-256 123eddbea4df83be…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 02:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18e522e5bda53e36df5df550c597a9c2 SHA-1: 8c6341820ed65bd8235546f569a420de3f406dfb SHA-256: 123eddbea4df83be6d834ce173786137237fdc2343571797dd46ebe72b487167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=validity+and+reliability+in+testing+pdf PDF link annotation
    • http://dogable.de/userfiles/file/72898564309.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/31816638770.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/sedija.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gidojipebanitu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6ae856613efcbfb1e1eecb18b8ad60fe/98886676681.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/limebalimolewujo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2a3dbb49---16867203408.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/53146d2a7d7708fbf7c811818d5b2e29/mesomopakax.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pevok.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ur6k7pg28759s5g0q1gp68jnk6/wifawivenus.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/38543403338.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d46b635d18---gapediluru.pdfIn PDF document text
    • http://oodow.cn/upload/file/210717040400385712pttjr53gebsv.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7a468992e4084a7b16a9313367977dce/14088561922.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gewidipuz.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/67827060105.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/8968122579.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/9728577215.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkhehq625akh7efph2m3lpg1u4/58646886782.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/nemurisizupevuweruxidupim.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bdd3038947f934b71fcd5832fb12cd1b/36183901686.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/49995598500.pdfIn PDF document text
    • http://bscartridge.com/pic/sawizaligazeruborunupo.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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10776 bytes
SHA-256: c73c39d874bd3f43a0a64282c6c72c929dd35555f3e2af509a8fcc7fe2d1c790
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17080 bytes
SHA-256: cc7889900b7d247a0cb38180eceba0ba67d3e533c3b7b7feba9f8c8935abb1fd

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