Malicious PDF — malware analysis report

Static analysis result for SHA-256 1250072d39419123…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 17:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e6c28e45840b3dbad9207a3d0d311113 SHA-1: 315916ab57bac2f55993f05fb069a27658c69cc8 SHA-256: 1250072d3941912396a2e1d2ca1d0ba69c05c887ae4a6052bfb1fb3122511475
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=how+to+create+a+budget+spreadsheet+using+excel PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e9516b1f10d6fd5f1caff8881f1685d4/rotejigufatirexuxilebafo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2a31eecdb1b98827c1705e6108f2d299/96755183518.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/84590556166.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/batezujewulixeked.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e19414aad09703f881446f0cbe97affa/nejudodasaletevetapanitoj.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/lufiwoxovirepulakeso.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/begeteb.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/69597401993.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/65558543939.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2pt8dfs3hhe641i717v1glghf7/92771058679.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d7a179ff---mogumejovibinatukelo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chfujjasjherkdv3qkonqq1nj7/36777347403.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b523cb96d60---70351229946.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/rebunopojigudofegebuwev.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/76365950760d9456ae5803.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f6a05179---xupazazusajotes.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9c82409f6d1bde7f4e938df30e9f486a/78759174943.pdfIn PDF document text
    • http://pneusmarene.it/images/file/89685768214.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/rubstsg5fbo43elcuvprfudq3q/30610864874.pdfIn PDF document text
    • https://tsegypt.com/file/kogobixolazomi.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/23488579614.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081908fcfc---wobidefesipufun.pdfIn PDF document text
    • http://yuha.be/_files/file/raxerimubep.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/2fd49cab0b5fce48b4412c992bb8d689/demelirutovemef.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/46118642991.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_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 17396 bytes
SHA-256: ea7304d7cc052a1eb5132d2a7129845d7be454736d3ac86e8d9b7916ac01bd55
font_02_sfnt_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 11212 bytes
SHA-256: b2f43a6de6bb648232f7e3e370890f543746a066f1a9a68c825eb54528671b63