Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d69f41c0342f413…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 21:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4376a8020ca5be2be9c693a5de453b20 SHA-1: 763d9631fda25fd4c16e423cfe49651685525ee2 SHA-256: 1d69f41c0342f413c1103fcdd12390ee2d0343ed5c4db475fbe257d65867ae80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=steel+magnolias+full+play+script+pdf PDF link annotation
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/75096461457.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/nijapofipe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b417ea023b---28516598962.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/vadogosizobapeja.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/jaxuvetozofevazezojuwogaj.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f6b5b1bffe32950a03c74fdb220f447b/37445117794.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160839067894b4---jamirolobumotifan.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///nanuwodunuzak.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e10cf29cbd---zezexavuvemi.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/sivosisizarisiniralufan.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/kowakadokawo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16122041f27ff3---xajesuxiwit.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/xefewikufufib.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5952120be---xezirulunubekax.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/eab8e5b15332c2b874604030d7af3cd3/74969064443.pdfIn PDF document text
    • https://tigaintan.com/contents/files/lutipebesuviw.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/mijaremimekoti.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vilom.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4ab64f58b6c4585659193d64e519ce7c/8674629719.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c191f3e4ea3---47359096749.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b679822ff1---dokotalevipanufazo.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/6276385007.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780b2dc32b7---raroliji.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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 11252 bytes
SHA-256: ace29d9dd4d609b1a82511cfd6d211d85b6d44f4dd58e7da517748b6a3a1c325
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 18764 bytes
SHA-256: dfde458f4ad91b1c753a3fe770db89b9822461cbb7ba945ecdbdf351d10eef09

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