Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f8d75a7cfe124f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 04:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 429d94d8ed76a2e3d9aa3fc31fe8a714 SHA-1: b7b8f73a46add7986cd77335fefb0e05c8d48f53 SHA-256: f1f8d75a7cfe124fb2d02956dde4830b1e7e927593c8a66ed32039da6b2a45ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to manipulate search results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://meble-tk.pl/userfiles/file/mutiremexupebej.pdf
    • http://banquat.com/userfiles/files/20121154244.pdf
    • https://digireg.se/upload/26789316004.pdf
    • https://metricgroup.it/uploads/file/bamikovobekib.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e716ae48ae---jirovofumo.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a98acd70fbe---mofijuwire.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac537b81e41---17611324306.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072943611a14---tugowawavilepipoxunoxeb.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hoo9j5f0u7oaq555039tskjbkt/92049888682.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38a14574b---bamezupexawa.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/47671446239.pdf
    • https://mimpishio1bet.com/contents//files/9081625426.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3dfa6d2a0fb038fe1bb5f17ac392e50d/27907174101.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8096da713---19901175345.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b309ea337---jejatonagigizekorapig.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oebqe7addt4a9nhvd9muu6b2vo/bivabeb.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b485db2d2---74499211898.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3c59881f---36161976250.pdf
    • http://thecreditcrisis.net/clients/73966/File/58561582770.pdf
    • https://dijitalsanat.link/upload/files/suwuwagotefovax.pdf
    • http://www.iece.in/userfiles/file/janufatofaxisosijikikorow.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6675a1d---90974256177.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mvt89745v20d37ke887peknbf7/96172719562.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tattoo+and+ear+piercing+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb95.bin
1becdcb8afd06880e75afeea1d6de8f9e9c79a28edc3b3aa71f6bf7fac958da6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10604 bytes
font_01_sfnt_off00010399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
font_02_sfnt_off00011bab.bin
61fae0ede41cde1682c530d5002384acfccf13d70933853593833cbbc14d7ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 18056 bytes