Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a11acf37bb79e3…

MALICIOUS

PDF

96.7 KB Created: 2021-07-08 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e23590a6d71d970e371b1b3b087a11e1 SHA-1: 0636575fb75d47f02c072cbac107f1825f07c688 SHA-256: 75a11acf37bb79e3f141cd028bdc98929bce376d75eddf8cc64f4cc569ab7453
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content or phishing sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://queure.ru/uplcv?utm_term=how+to+text+a+girl+chase+amante+pdf PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/re9qkh4un9qq02ogmfckrsc7b6/zojedejamewufanezod.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/runenu.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/tidipabe.pdfIn PDF document text
    • http://altinay-law.com/images/file/6888809873.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0010339001621144135.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ceafac20a23769eee80b4ffffd09d50d/42948397130.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609725ec73ce7---56351372163.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c56cb5d2a4737efbc1753438da1be194/vaxowididifamina.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/705bf26628cd99711cfeccf2ba746bec/22646392547.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2210a260---46863685107.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/lebaxuwudu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160983ee4e0d5c---72545594435.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/42194447248.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/o51mf5lkfpqe5omp9udj86u4os/49662697432.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d81f5f0---nuwiwasabepegiduji.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/68003860860a60acf28089.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5ce11160b9280e84b7cb6cc8be26750d/99454187178.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e3f32d9ea5dbf0e823e70938238801c3/43097610900.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/99542727456.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/40771918496.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a0f3e7c92---17227060755.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a1f1542d---98675477111.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5905fe0b---muwora.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/76e55bcdce005445f220c935689aadf8/10546027013.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jarezefiti.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/97256474005.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_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 11244 bytes
SHA-256: 05e590c559b3eeb37741474bc54e299480acc8c07901781febaa150e16a9bcd7
font_01_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14781 17652 bytes
SHA-256: d0be1458809e16490fd4ce0c96cb13071b64ebc2a7e58372c54e0653472a12b3

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