Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eb8215a376361f…

MALICIOUS

PDF

128.8 KB Created: 2021-07-06 07:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 717c1e5bb007c205c3447759e48e6786 SHA-1: b5d1098d8822e66395354ddee8e593326b01a277 SHA-256: e4eb8215a376361f1ecfcdde9b1ed4ff9e3098d852fa566fcf699397d8a1a343
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or phishing. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075da60ca752---12822821501.pdf In PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/vuvepi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d334549a9---97073644404.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cfa3f02d1ddea2a6e990a443d6b7baf3/kewevoxoxuba.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe07697f89---surinibimapalokefiduwote.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f0c004f3---28268030034.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/gazezawigeriletir.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/68369234523.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e749339ef---xixajanudefujufusoke.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/21275097559.pdfIn PDF document text
    • https://foulardfotografando.it/file/lurimodiradimuv.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/558cb04231dc816c345db600a144ea50/93723843017.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9f3f7e4a09cd0ab58415d7277b5d4d6c/25012723760.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095d81aea5---wajofomiravegagix.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/87320748983.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/36912478772.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6c2df8fa---4983129969.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/90d8bbd6eb646bec2cdb0cd96b45e331/72620317915.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a06a336af---tabigemadisufutamuso.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/4206718651.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d8258ad4167d4096ee285fd34a04c547/bubuzujol.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/53138072043.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/333831b60f62b35a96396b887101fd2a/senirixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=68+hp+to+kwPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6CD 16312 bytes
SHA-256: a23b5f703fa005c88114c79ed40bed762aacab3431b4dfee94a670bc7ccce7e0
font_02_sfnt_off0001e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E07B 10004 bytes
SHA-256: b8702dc0b245d568c7034fb63cf599df716ae95ab1e1138095427a0d219dbc6d

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