Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fed10cf0cf0e33…

MALICIOUS

PDF

103.3 KB Created: 2021-07-13 02:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b550abadea9fd0d6d69ed420e95bc7f8 SHA-1: b8ec07573a0ba24f01c9045056658bdfa66c8f50 SHA-256: 19fed10cf0cf0e33a68193688c2735d2c09bd5e9c766a53c54dee39f56dc76b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or malware. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

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 https://garglob.ru/uplcv?utm_term=pseudo+clementine+recognitions+pdf PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4ddce0383c5b46ee4eec0d4d2ed09388/75018592091.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a3d59bf6ace1a89bc1c80973d5e9d025/sojixog.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097257bbd7a0---75390827289.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/605b95abbae59f1170d7498915cbc295/wunoferafu.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/tupizo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b871bf05---63011661939.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/62672010718.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/kakazusemefexerop.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zexatesepine.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fewagotal.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7g2ovutpmrip6j9cqbd92j0qjf/6131325320.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105fac9dca---61817633178.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/okjfg57bbn4s1aint2tbfo2l7f/robapurexalid.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a3ca0e82b20a413b2cbe06b35fda3b79/95995417995.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/61770197411.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9je4pagbvsfdfqnfl3gunve404/32148925687.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a284b565342---95776923205.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2198bb90807dd1cfc5e3de411ebf3abd/68139022540.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/27411329964.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xaxatobanawufapubikapip.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cdc3ee55ed0c113eb1de5e26924c41d5/tajifubid.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_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 10904 bytes
SHA-256: 0312f0462cc79f82788d6aac81f8eacaf6226bcc98d1acd394ae9a6f2358cdc9
font_02_sfnt_off00016241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16241 18088 bytes
SHA-256: 32311b1e73dd03f7d994b550e1b6a004ada70202fb7b9c0146196f8a0782c23b

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