Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a23d838acfe5ad2…

MALICIOUS

PDF

90.3 KB Created: 2021-07-10 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3d70c3e95beb184b38cf5e9d51a2a8a3 SHA-1: db11a91ca0e6e82de7712a25d3320bdfc0e2df99 SHA-256: 3a23d838acfe5ad2074c3a0ad0c254d901f5881213c09b62cd1f2282fb312408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of link farms used for phishing or distributing further malware. The presence of these links suggests an attempt to redirect users to malicious 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://synerhu.ru/uplcv?utm_term=conservative+family+meaning PDF link annotation
    • http://instandee.com/Images_upload/files/dupibi.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12818317828.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a72ec17b7---woxafivodoruveledi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/11407508658.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f51ed8b92c6f8646c75b96129c18bd4b/lonugiz.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/68796041148.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kixagalevikon.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/5757913137.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e332862698b---18878847439.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6091116---mebegoxovadoki.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/firojokubizoseza.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/33178208553.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83725250423.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/57111946784.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/tizixenisekukimatokepuzo.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91163e6be---49720458928.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3adb195f3---momanigegevopa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3392qagalo8uh225eld2t0pius/dulobozinowedufakutamu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c851aab0b15---vipafobuzudevo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/40422106824.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/91a8e6e44738d6834086c717e42be482/bosaxozekoxofotirisi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b141db33---29628181807.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5bb1b013---kizupufon.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

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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 17076 bytes
SHA-256: 00c6c688f578b03bac57c7275a5e5df8c1c70933fccb5524a87148eae30f5928
font_01_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 10768 bytes
SHA-256: 919166da0ea0a4bf58af9f0eb461a6e4c3165574007ef62c593c3edb021a23a9
font_02_sfnt_off0001443f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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