Malicious PDF — malware analysis report

Static analysis result for SHA-256 040edbb0f0c4e94e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 14:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6bca903e7d627f2da95f9a76b78625a1 SHA-1: aa03f71a972e6898b88fdb71ba2847434b12ea32 SHA-256: 040edbb0f0c4e94e9bb2c1954c8c5806da588b65e59108567947fd47a212b222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gsemilia.it/userfiles/files/bukegupudalitisapubirojo.pdf In PDF document text
    • https://kawanmto.info/contents//files/49190450180.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/12711113645.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd84c080b5---limirolewufolalibug.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5d5c7360db2c5570d8b1dfb641c99587/vopiwirenetusi.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/42533670853.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/41772106854.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dd2800d5---vasaxirutarusejiloxofo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/bojuribexevufumikix.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/narafivofiposekog.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb00e45a4---81303815781.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161098fd852821---57559532014.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/wowolawawe.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8fe3e398c1bbb8b9a8da605e5de64f4b/94597874594.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d14f1d90---80318554289.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/sekarekuso.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vokudutilezuwa.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/88515298639.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/20644126544.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/tarexoxavosateva.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/44576666768.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/biponurufutawor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pedagogija+obespravljenih+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 21456 bytes
SHA-256: c0b31f2105b4ec5a7ce6d176e95b5cff973793df536af8be16c57f1ccc4f9218
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 11016 bytes
SHA-256: e1de05fc273931c4491ba926d756b31c5820c6437c3ec0eb209967a6636a245d
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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