Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f657f56e6168ad9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 14:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e110ae72a88cb91b811b70ae8e5c4d8 SHA-1: 993d7e6fb77831bce73d28cfeae3c5969466b048 SHA-256: 1f657f56e6168ad9592e14b17db449f533bb8630ac54166abecae2161be5b041
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm on potentially compromised sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://apartmany.cucoriedka.sk/data/files/nuzugosizifaraz.pdf In PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/tuvekubeduwolutokipe.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zaferaxefuja.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/gupomevovabikotikagebavub.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kebigepapozuxowirobizugik.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/64167601358.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/57078518256.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39366468974.pdfIn PDF document text
    • http://jinyezi.cn/upload/48547317757.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1933509316133d57575d20.pdfIn PDF document text
    • http://smogy.ru/files/files/depakejumasilewopuv.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/fojobimafinitagupejosipi.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/vulewe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213f229b8f---tagisimuripa.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/64142645137.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7fc8e54c496e64951a92b2328b705e6/21569658511.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tulodetoxinajawiza.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9i36f5ipprmaqh1oldrrf29pvg/99416690950.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353fcac42d5---24601118351.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee1e2daef---nizazobujut.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/jivufajexebitimut.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/61261994866.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303cbc120fe---192315846.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/43079641003.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/wusikok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=photo+sajane+wala+apps+download+apkPDF 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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10608 bytes
SHA-256: 0115296285f396dd2f4014ee20942714e43d9c2016a175547ba08db4b7ba6e62
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 18244 bytes
SHA-256: 35d2a2c12df861a0d86d31ffd63e634252e2f42e473b955334fd188ddcdb3a4b
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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