Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba9b6dbf123b3f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 14:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: decaaf4f5b9213bacd9d0f5079b5f2bd SHA-1: 53d61dbb15dcfd97d1f38a7b0045319192cda01d SHA-256: 3cba9b6dbf123b3fb7929ce8e90773407305aec7e9bce452e2a8e1b394094235
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure indicate an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=plants+vs+zombies+free+download+for+laptop+windows+10 PDF link annotation
    • http://chothuexehochiminh.com/userfiles/file/31212703079.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf05268c---87674534077.pdfIn PDF document text
    • http://e-hematologica.com/users/file/41473730842.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tuvid.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/venonujuwidejupi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/80477147503.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/nefopoxawenebagelog.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109110645131693.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/89472340382.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9331b1849---gofarefuvakag.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sasajanito.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/28508150258.pdfIn PDF document text
    • https://ekransamara.ru/files/87343712827.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/gufesuzegane.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143e80e7f0f6---vukibixufilu.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/kitifazesedigusoderexu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/tobazikasakulexevazirixov.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/2105826194614b6a4ba2cf4.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/xotesomefenivesolatedezaw.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/77756848994.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/regajorakopiti.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161369afeae913---15286701952.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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 18728 bytes
SHA-256: bad24607d2b85044dd2e45dc2ae3a44c082cca28259d0a11d775d6496977313d
font_01_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 11188 bytes
SHA-256: c981ee70314bd1b0d5b756ba4b112d4edbb1ab60876e7981b32c358849c8caf3

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