Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ec6d3f57064daf…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 134f5e76d300b30f1852173e9ddc326e SHA-1: fff77a5c38e8621db01a7092a52b48a37e231970 SHA-256: 18ec6d3f57064daf8bd28010a0fdf5d3c9078ee6163e38803d24c7fb201a286e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a distribution point for further malware. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings and URL analysis confirm its role as a malicious link aggregator.

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 https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kuzowupenas.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b120265b36e6eb41651915781f72d10d/sinelotinibefuliwi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/vezubimin.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e2a65ececf3d41ab485946e4fc5cd5f2/1338066653.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b30874293da9850cdf10827b0a2e4fea/nesuzeritamugisilada.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gu0jonbfobdvo2sdhafbdnhu86/28091785272.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/36398508486.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3vt69gjau4onq14r03cfjq4vaegg9rns/64490187330.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/gupaxaji.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/146bc32139298fe1a4cc910e57b83aea/deruvokowi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f25254f584d49c2150532dbf1a250c48/zegogoteziwubusesabadovij.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf00e15bf---8689747859.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/tuxobopudopofur.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/77826049489.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171f0dcb2---89671897964.pdfIn PDF document text
    • http://geose.ru/userfiles/file/mibuximikiwibajexak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wexojevojovipuwebas.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613aea8493---17844405921.pdfIn PDF document text
    • http://cl-pub.com/files/files/gilelava.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/86515562578.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/1656896943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coleman+aspects+of+symmetryPDF 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_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10696 bytes
SHA-256: 79938bb23d3a09c80911332ff100d387a6712eea0ecbbe30f86e8f5cbfc90e33
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 17424 bytes
SHA-256: 8b023ce84beb0eb5981d02661076c5820bf22213a708bc540e30795249789091

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