Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d5663a1859e0b…

MALICIOUS

PDF

83.7 KB Created: 2021-07-23 11:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cff44ffe5319aef96fa93272ee44075 SHA-1: b26cafcd9536ab7ba42210c21b77f0bf81e26d1a SHA-256: 5f3d5663a1859e0bd0a4dd87d64ae3ba287b76ee10335a17249bc5cfa7ce73d0
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 CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://magendans.com/imagefiles/file/zozijinu.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3796c16f60---82179014497.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bm43c5h7h4h77927jjhkjtbbl2/11567098767.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5544f60af9---61424529065.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/57687272944.pdfIn PDF document text
    • http://www.asslar.de/downloads/raligu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/38088835379.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e18bcf40307---dokakodisuvenawoga.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/21ubmr92ctuvv6priud8bm7351/fagaripekulubora.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089616ee1db9---dokukifovev.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ps2rv7ssif0jfdmtvq1u4f7q3j/81193343718.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/88100373346.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/7882060131.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2025a87c---71972215223.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68415098867.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b95076d7f0644c39bebf04cdfcc8ddae/kebenapodedupakumu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jimipitinugawodus.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/gilavuxalakewajelodu.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/44537891591.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/82219831676.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/91b910af077b10a7e994fca684269ab9/wozafarase.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/lasoxonore.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/63117251271.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gsqe9903ab7inmcb1ibra2vs05/nukukonaxupenafulaz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5432eb72---47584980804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=photo+credit+meaningPDF 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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 17068 bytes
SHA-256: 0be9944cbf1b05728072c9477cce9d31b76e6bf9355fcd6dd8ebd066c8239cd2
font_01_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 10604 bytes
SHA-256: e978979aadea6c050a19a9d80f6f9e3f614b2ad3aecd9efb009ca711bce97b01

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