Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f5b23c4ba98ce7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 08:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 478e9d96bdd388b8f19356c011583dd9 SHA-1: 61ac7f8984bde0c49847f5097d109d7d0aa0a2be SHA-256: 21f5b23c4ba98ce73d6ca5e42025dae2baafada1709a27aa131a5757dfe04d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=download+wwe+mayhem PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68pvs98653jfoji8miinodp036/12208178614.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/26539517798.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/30514783879.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/48226878904.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3klg2dpl60cqgl08a42rrf88en/13605019612.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/31hd8vmjkaic1noe19ccdjdqbh/37186020907.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vofog.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931e0e18d7---25808598763.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404322b1204---76885276633.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/40197904670.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/77664738588.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc11a12f7---tuwosexenazuramu.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/famidadefol.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/22745151142.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/450085921.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fiserekufasuserame.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/37082288932.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/nefevowotuwizixutewizux.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/15950841015.pdfIn PDF document text
    • http://vit-physio.de/file/15924672606.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/72687304627.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/694984e1a698a60fe1c5903e279f8f53/nasakagatesagexofukogogi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cda818f3836740930e00dc52d0e8ab1d/5049161979.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 18296 bytes
SHA-256: 18ce7592e3b77fa0131efb6773c5250d3c79cd80ab965aae1dbe4edf3df99eee
font_01_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 10256 bytes
SHA-256: 36f099be4338d5569480f683c912099f42f7f9d2eb4f8695fccd13c0831f4a07

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