Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b558fcf169e9b83…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 12:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1a89d585e689375aba80a1d189bf9e9e SHA-1: f1c57288376dcb129e2b2b15e7661c04c157d94a SHA-256: 1b558fcf169e9b83ca0da1274a0affb2176ad0128343362687c7117b521eddc2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for file hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The structure suggests a link farm designed to distribute traffic or host malicious files, rather than a typical document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97257e563---tidorelosasibilomezo.pdf In PDF document text
    • http://jtour.vn/userfiles/file/16431163576.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/97669859280.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e7jgtkm44iqp83ireuc321tek3/roderomajexeroporozumegi.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/76016616149.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe982e5c9---97929279679.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0cc986fbf37c558a146aae94b13367dc/35935076158.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gqokp2vl98bb1glilmd7u1famg/88910039245.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aecb6742a799d55b3e8d248f0d49756e/23043156071.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/regalepiw.pdfIn PDF document text
    • http://hibertek.com/image/files/20210610_045953.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210609001649_1c78z5.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb8eda013---62787036498.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/56970152569.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/vakezugovejej.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0qassh1blj2h3vpqdcooje2fpo/80323155912.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/52997819735.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a862230911a---72595349653.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff6656d54---makifefefepitafasu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59db4a0b---mezugowavar.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e3846eaa---81698325284.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nodelofoxagaxalajuxuwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+write+radio+script+formatPDF 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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10708 bytes
SHA-256: 219c96ff411753afeed8e012c7ee9a1a37dbf756a841b4eb950bd7b88fa658dd
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 17972 bytes
SHA-256: 48e45a5fdb9f5093cfb90e567f40f77fad40345b72ffe0cff695ec4b1e650119
font_02_sfnt_off00014904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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