Malicious PDF — malware analysis report

Static analysis result for SHA-256 910de1fd0827c9a1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75bb8d866556e34d2f82909846c7da0d SHA-1: 3f381aed541bf2aadea53503ad95885a79e7dc0c SHA-256: 910de1fd0827c9a11fcdf91be4156516639e77dfd61d2eba1ae164e3ee970122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and a link farm heuristic strongly indicates a malicious intent to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://1tlstar.com/storage/uploads/files/392615988.pdf In PDF document text
    • http://upasamed.org/Content/uploads/files/jakilatasudirabovivifexo.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/70125471820.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/21080726022.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dudefakuke.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/bopejavatibumi.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/zemalopogosa.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc42e69ec---26632190964.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/13188871208.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/6420700330.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a37d19fa---58317437594.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a2e6f9725b7380c7f340d7859e770484/73397952362.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/71349261057.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/70208671445.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/19885042710.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/xekaguraxasetovel.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/68225909465.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/vitaranusezexal.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/9276935763.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/55425947563.pdfIn PDF document text
    • https://wittnebel.dk/file/manetora.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/13318505375.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/zatuboseloxufogitotebe.pdfIn PDF document text
    • https://spyboarcams.com/files/vofafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+earn+minecoins+in+minecraft+pePDF 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_off0000b4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E1 14704 bytes
SHA-256: db91e4188e260ace0fe68777baaae836d3ad219435c80a4c602a4c5804a18336
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10672 bytes
SHA-256: d5cb97c475694d3ed9222eff68aa07a7f4cb1e9e260d859008cb0d9350436fe1

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