Malicious PDF — malware analysis report

Static analysis result for SHA-256 6748f0a42d07ddbe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 02:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 271a7c5b942d2ddd75219a4caf8e0606 SHA-1: 7df4f79e9ce753178fd82f0317ae56c8b498699e SHA-256: 6748f0a42d07ddbeed6011858e97693c5dc7782bcf7aa675dd93d3236ebdd38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=el+estado+social+de+derecho+en+colombia+pdf PDF link annotation
    • http://emotionpicturesfestival.gr/userfiles/file/bokibiridal.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/gub8qdkun3e79u3q220l2df82k/12019680694.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/betuvakifonomuj.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82203453245.pdfIn PDF document text
    • https://ksboutlet.com/file/files/wukirevamilawulibolajuz.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/84906226477.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/pawulebizema.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/30372341720.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/83801438971.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131649ce6138---63851776400.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210616143809.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/79769253976.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3d11f247---16521383371.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24cc60435b---69964609752.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pezofisupisipinege.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/63750537909.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/gazemaxedorujixajodip.pdfIn PDF document text
    • http://elitvorota.ru/f/file/66576414695.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210714_44627EEC2778CC96.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df4162b83---82749032782.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c3557843c6bf8a8eb79de4e793c4dd1/58929952594.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/24006284293.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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 20024 bytes
SHA-256: 5e0851a836ee5a470d5209bf61792db3b951b2df680a0ef7f4f56d9b9dc27c74
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 11008 bytes
SHA-256: 801135b58f1bfe62eceec5160cac07a115eaf49b61216ba8e1e32ec76f3dede4
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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