Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4c95fa440e1f29…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 20:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2f5e09aa3144e741a54884da08de825 SHA-1: afa4eb25d60f33b14045d55736afb74745ad6106 SHA-256: 3c4c95fa440e1f2972e66c64bc8d11445563c16ff693e925f928b77286ec3015
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to redirect the user to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://logo4you.dk/userfiles/file/87859169626.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d46e14d79---puvenoro.pdfIn PDF document text
    • https://alutat.com/data/file/sijeguxasepe.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kifotidu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe345d6fd22---tigoja.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/52726084572.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4235c34f1077cbb500c8b9889d4949a7/fuzugubasasedarero.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70333dac45---tunodisawikiw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181baeda05---pejisobinopem.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/75296215685.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/63303283031.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/bewujekesikarozupazi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/69328170283.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/us3ql7m34kg18viiokrls2252o/doxedowosizew.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94a4dbd8a7d88ceba4b5eee4aa2e7db7/lezelimeg.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/vekejopuwejonozi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658f827992---54577381091.pdfIn PDF document text
    • http://willbramephotography.com/ludunanejamoso.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f845119ad58---pawalu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/pifizobuxonadovuwejiwoj.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf49398ee6d1bdef23424ce8238278d1/banoxazanifasawutiwo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8f4592b9---10901409979.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/94929407914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2014+dodge+challenger+manual+transmission+for+salePDF 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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 17144 bytes
SHA-256: e96cc69701cdbf9a88790a99a8bc8b640a719c31a62121dbedf6231208b9efdf
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 11300 bytes
SHA-256: c7cc0640b200c1dc0bba41a8384a6b80a17ae322c4f98c1111a8e806199af924

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