Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cd18d1aac15dfb…

MALICIOUS

PDF

90.3 KB Created: 2021-07-07 02:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34cb372eed772d25d15f0bb6dae89ec3 SHA-1: ad9066665c30bc76e91e66c063fa1620a37c2740 SHA-256: 34cd18d1aac15dfb2550577694e4a8bb551249dcd54ca3c937b36993199afab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cba5523b2---28819379276.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c00096a0426---bafazobagebufuzoripoko.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/fcl2kspig31tt7nvqdkmmdhu5n/wuvitinoxosev.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5dirnt8o7an88eimgmah1kqh5s/11075715101.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494289e0c1---volajaru.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/da45163bd183d50c87691b2fb802a869/76219116202.pdf
    • http://controlsystemco.com/cache/fck_files/file/34365978757.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160931e254d65f---51223578737.pdf
    • http://vuatoyen.com/uploads/userfiles/file/89843956262.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9824abf87bb07307a3997b89cf881659/43065952329.pdf
    • http://brenno-tojestto.pl/userfiles/file/perejogowuxukinixofagezal.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/88ad976a8079bdb72a524dfe98fc9acd/4265165132.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fc66513e6767020b6a5dae4e5e7b9f9b/32504467128.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/83316841640.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/jofabegulilasosijevax.pdf
    • http://amon-syotengai.com/userfiles/file/17313451481.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/al63q4j03sdjoinabo1jjai008/23469291441.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cef9469bdb9571a71a8f8d49ee5e72b2/2540393084.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cgtflnu136tfd5u5kjf0d0kcpn/68244797198.pdf
    • http://promador.pl/userfiles/file/6221751212.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d028669648d---26769921948.pdf
    • http://servmed.net/userfiles/file/vumelodaragarepafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c2787959---83013685310.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fp0hmkfl6c2opr5tuve961kece/19443873202.pdf
    • http://ekonopuntos.com/campannas/file/temawigojaxuwujegew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=frontiers+in+cell+and+developmental+biology+impact+factor+2020
    • 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_off0000fa7b.bin
19510af6cc0000b7fce621ce90924262533921bb64bc04ae56fd0508f07b3bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11500 bytes
font_01_sfnt_off00011552.bin
0f55dc0e1831a560c5ace4d154fba82d0a11d2393ac237c633d3681c28ec4bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 17684 bytes
font_02_sfnt_off0001434e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 16792 bytes