Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9835e18ce5e6874…

MALICIOUS

PDF

110.8 KB Created: 2021-07-03 09:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: af729f83b326bdebc37f2d2902eeab14 SHA-1: 6d6e04951b3c459cadd2f585a1c51131e9842816 SHA-256: c9835e18ce5e687465ce01f0d72eebb439a6e99e8c27c37ef437fd3ee90c5854
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Additionally, the document hosts a link farm pointing to multiple PDF files on various domains, some of which are hosted on compromised CMS uploads. This suggests the PDF is intended to lure users to download further malicious content or to phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kueapem.com/contents//files/tenazajofog.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160889196f058f---wixizofofoduvorelikig.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/9349244607.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/xujaz.pdfIn PDF document text
    • http://charivne.info/images/file/monaxaremalowakeratasax.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a14163097---foluvavutufako.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mtp6olq2gdc12mu5u7pmnf55g0/bonatufovirupomoraminodi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/74427685229.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fokowijaxezizo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/33474043121.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/54dfa7971adff22f825173d9b2637d52/71186737148.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb27a676eb---45830883548.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51487696d7---gaxil.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pg4onbiilec3im5p6pf6iupqi5/27472367468.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5b298873d9aaf978eeb06fb5b0d6d49/58719694741.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815719aa3d8---xefowalofasaxazi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/48ee35cb774906e0b985507276b5be3b/rumozelaweras.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/72488885976.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3a0413121dd51e8c2b0703e18fb0259c/5401908472.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a32a2c32---27721918768.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/03/file/20210703_123134_181.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/87018507855.pdfIn PDF document text
    • http://jarosi.hu/files/file/gefakojenulonil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+classic+of+mountains+and+seas+english+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 11028 bytes
SHA-256: 6b91b929585799be8e3932a2f5c3345332d563b635c5cf2dc3454d9cfde228eb
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 23232 bytes
SHA-256: 269663318860fa1cf8d40a4b679b7d1ba2aa6edf2ab28447623374db303d3586
font_02_sfnt_off00014293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 30384 bytes
SHA-256: 4dcb2e4a1fcfc743c13427b0637de33a09fb665120deae7a03802428afc474d9
font_03_sfnt_off0001950a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1950A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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