Malicious PDF — malware analysis report

Static analysis result for SHA-256 55729c70f836ecf3…

MALICIOUS

PDF

93.0 KB Created: 2021-07-15 09:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 927d7272ed3d1223e3bdcca6bb23ab5d SHA-1: 213bfa6cc84d7d87367480ad83c22b7a2ad1593a SHA-256: 55729c70f836ecf316933c2624ed267d0c49789aa067f1301586c70a15a745d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with techniques used to obscure the true destination or host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://menlopark.com/wysiwygfiles/file/77113683758.pdf In PDF document text
    • http://namuvaldymas.lt/userfiles/file/zaroperotu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc430414---wavamabowutijozagetox.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/36698716554.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/goviwatenunigupizovib.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eccca24efe78889a18b9d011e89d7626/48865835001.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d3dda6cf82b8627cbc3c751255f46b9e/lapodutosu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/daxopotepunakujisepudo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5e54c47c8c02415f37c5292ae32f0260/86825892199.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mifaxu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zigabawal.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/31048118906.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/1173835752.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/masokegufukururakarukopek.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d829c8fc---xosifoneton.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/urbi22b5k45nt96pmrkjn9sbh2/zojijilidexo.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/suzowowutegotitoxojetizef.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/270ed502da89e0fd130e2e4584a212d1/69968240114.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/43369163377.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe0bfae6---nexuladalonada.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1fd8bd14b06a737cac58a612d325b6ad/tolilif.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e38b5f5---kumopukinej.pdfIn PDF document text
    • http://fabtur.ru/upload/files/93405950501.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/61381393336.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jdanp4msln1oga7a7pj4rqdu25/futusoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gad+7+and+phq+9+word+documentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 17028 bytes
SHA-256: 411d1592d5763569d86964cb2a37a49c5549c81c3b724e5b1f51cbd556827ed9
font_02_sfnt_off00014e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1F 11060 bytes
SHA-256: 4d057d292bb1f82c9886bf0d6bad43388b1d41472ef6d93e3f63b554eaf81704

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