Malicious PDF — malware analysis report

Static analysis result for SHA-256 829377c41cecfdb6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60fb4af477b217286a3ba069e82ad274 SHA-1: e6df9dff6742fac0e096749d69ebdf02708b944e SHA-256: 829377c41cecfdb6b8bf5567c5d41da6c98e3a9b4af7eb937c90ecb2a8a70ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware or phish for credentials. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://noventa.cz/media/files/file/zojuba.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/10121049698.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/lobisufatebezowuxifivexo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/870c6ffd5b640fd664c1a93a22d7c473/76648095467.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fajasuvuwazevezadil.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6b76833a50fb6aa438a880809181e38c/perufejivekelejamuxi.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/47188624234.pdfIn PDF document text
    • http://budka39.ru/files/4593480990.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/13ed0592f317db926fcefe7937047165/48899175609.pdfIn PDF document text
    • http://namngonviet.com/user-/files/23727562896.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0cc6423d8bd1495a908e7e9a177d8611/tonagibodakeko.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ad967ab3---wojikume.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d91613df6---wafofobumidofitokixok.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/91427051523.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf9e2bf07---vivosifomopawexifamesomo.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/74639846836.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3cdabbaf03349b8257e8fce80b057e50/wewigajimiwaduwavivu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xuzefigi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/km1e8r6n416340ub7ss8c70o5h/nivebixuxiji.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/12188781039.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/15990529037.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ad29c1fa---zesododomijogusifoburefu.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/87261742439.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/43ft88unvtb6g2i03jn8etb0o0/77772611458.pdfIn PDF document text
    • https://drlanda.hu/user/file/28888225181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=use+preflight+pdf+aPDF 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 17432 bytes
SHA-256: 51c06469d11556c3de0d2389799ade769037375858a6240399625a8ee57aaa08
font_02_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 10560 bytes
SHA-256: 5e9dcc924d5a1d7008d03c15fcea861a165088641521b84ba1c93d0f40d8c13d

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