Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc349990db0da9…

MALICIOUS

PDF

90.5 KB Created: 2021-07-21 11:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0e897948fb1a1a7b5dae7db621ddff8 SHA-1: de144b3fb3167cbc47afcafa4d7c9e2ca797054a SHA-256: ecfc349990db0da95687cfcadec43956471aa402eb71991a3fcb4eeb2c33da55
96 Risk Score

Malware Insights

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

The PDF contains a high number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://zae.me/datafiles/file/57696909894.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ul4u7td6tq9lr35huv6ec69nm0/69206497351.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/mijagivinoj.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5bde0cbc---guxikadajit.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/gedunubulidu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/35957846646.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/170962798760914d3a1389e.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/32814312995.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/61876447194.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f81bbddb9eb243627c3309745db4c832/vakopusuridigedesegunu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a4edeb45---80460689844.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jogupawerowokuba.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b66e0bd3a1115a30a1d157663ccce4a2/70621316823.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ea01557f2---noded.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d16522359---99190685125.pdfIn PDF document text
    • https://hsse.cl/files/dederemiboxupapa.pdfIn PDF document text
    • https://paperland.bg/uploads/file/gebewarigo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160859b077dadd---jusizebolajaliloxiw.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/37543355306.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de4226e1c4b---50510440616.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wezulederi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5abcd130b2410a21cd08956a5023327a/bamewikezerawexetenimaxok.pdfIn PDF document text
    • http://inistor.com/ufiles/files/96591867877.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9634b9af---5832848126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=short+thick+women+nudePDF 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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10612 bytes
SHA-256: fe30c6eb9f3b715caa8f16a710fd4beb87669b58fb5e295c86e7267455223d25
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 17800 bytes
SHA-256: de9a20a4bdcc0ebd4629c50263c8add5fba85f7990588a94027016c64cfdad50
font_02_sfnt_off00014495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1