Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26934303e1b3db9…

MALICIOUS

PDF

77.0 KB Created: 2021-08-09 22:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aa641087e816cf6401bb48e7968dd94 SHA-1: 6c00adc1e8e7006761ea0e1322064eb268217581 SHA-256: d26934303e1b3db922b8a42718d5b4263c11626806a8e9db152fe6f3b42b43aa
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 or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daikinhbac.com/upload/files/derovogumugavepeligozitu.pdf In PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/lenebuxijujofudeje.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c959dea5---586516313.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/46851252696.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/fozura.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dibazivinezowebuxosa.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/84347051353.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/98584819903.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1625720582.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/18800418217.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/11590839977.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/57590148286.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1l6pgi5op54408ckjtjpfgqo6c/mazisiwawove.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fitijefuvoruwotelad.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/8eapjd5eocv3u04nrgjfidiga3/lilurawonudexufenejira.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/wixuvumilovevejuzekal.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/43307a03b7d1c2fc7cff0a5a6bbb5d4e/18304447664.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/nefulodotewavadasir.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e90e3b549526c2890944ab254c143d23/ruwemo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/74566539051.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8b3398050cfdd29ce56309341664e7de/fuwex.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/nmd49thcml971k04tk16eorj76/96566444823.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6584fdf5f0b69bd9a0c23b594cc2617d/demozedavogixewurob.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/goguvid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spongebob+lab+safety+rules+worksheetPDF 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_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 16480 bytes
SHA-256: 4e7c7120662dffa1735a8f9c4fc461b905710803db3fe8eaf14ba01d73445e52
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 11152 bytes
SHA-256: 271055794dfade7e07748604a508561234b83a1ccc9a723e197ed0edd5784ebf

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