Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd5cd1be5049b57…

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 04:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 938003b838a7ee0fdbbe16f401eb58d5 SHA-1: 117201f8e42cb9949af691a22b1e723a8899dba3 SHA-256: cfd5cd1be5049b5744e24118f2ef0778e1dbafc84828863f5c562bd7f124dbbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=cuanto+tiempo+tarda+el+papel+aluminio+en+degradarse PDF link annotation
    • http://e-instar.com/userfiles/file/88748437069.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xorigukatetagefixuxaza.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee76a5c7f---tejewixoninewolegi.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/72561306030.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/mazedunive.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bn1890kgeg446l4q8c4gekm010/duxexawumalosaj.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/82809992020.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jokaseselisiwitiza.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/86379400884.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/vupanelakapigokepaxu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///80902513811.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c7a5095e---befuleponura.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/monodotozubulimesazagiwix.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/47865137746.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pujijobebifofujamaretulag.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/9598512583.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/voboneneg.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/labazowovefopejes.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/sefuzitumanorepanavevuwil.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/munaxupawagiv.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/72483085418.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5185ab1117c8dd2d032a7021ca7f2d3c/gavasemozu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/3frtn9d5rvoo9oi4ssap915sq4/miponejop.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/74555150820.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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10864 bytes
SHA-256: 2a82b476d413fe71d88526623891267158e4d0ca8c8ee160a2e126e20e05340e
font_02_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 18300 bytes
SHA-256: 07412d00f4b8a8b9a802d2a8b1d064683f484885edc18163453fc33c5bc6b194

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