Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e0675cab6ce0e…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 07:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00c84416b3f70e028b9019e475d70414 SHA-1: 6047de68dc82f554f4f582d6d389da513ac78d20 SHA-256: 131e0675cab6ce0ed0d32412fb6fe71145b212d9639c7527667d43198942757a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, distributing numerous URLs that point to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=samsung+s20+plus+vs+iphone+11+pro+camera PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305c80e6c11---wosabaruxojoraru.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/fopatasabekof.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130228fde71b---fuxikarav.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/10132363862.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331199bb87f---2640754438.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8toe387ni91m3fsc8lau7d2rq0/97695085378.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/63320059165.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/96696734641.pdfIn PDF document text
    • http://snsi.jp/image/news_file/46351469894.pdfIn PDF document text
    • http://stonebreaker.at/vovipezokaso.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/nawukevewotodanuvawa.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/34481077345.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/60824065844.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/63522188673.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/pewusokusafuzazigufogo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598d5e33ea---zajokuwopu.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/puzorowagilatavamod.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/74b917c289209111f3cdf28a08a2dbfb/23434952437.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/43626899271.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/goxerezi.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/25711507644.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wijevutami.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wenib.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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 16484 bytes
SHA-256: 628a2eae93aed4940c9ab0de027c27a5bb733db516832d36dd531e804fbeede8
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 11256 bytes
SHA-256: 027d2c96b83f7756760d1e90f9d3e1c2d57986bb7a94404386fa8b773f48fa05
font_02_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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