Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeef1c0b6f46a13d…

MALICIOUS

PDF

99.8 KB Created: 2021-08-08 20:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edd7d5ab6f5097543ed63bb43fb22c56 SHA-1: a06674850e28fb255d3b25a8e5ed23b36523c822 SHA-256: aeef1c0b6f46a13d8f6bec6fdbeea33326c3ed82b744e1816a56f455513f65ca
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to deliver a payload or phish credentials, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6685

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://zabradli-znerezu.cz/userfiles/file/43141589887.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6acebd8b---77508481520.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794149b63df---zuvusufuxejoxabotoxorejiv.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c25d6682e11d1e84de34e50e0c4f6cd/73811849022.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/giposuvegaw.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fidaw.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/25735451977.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/81192921776.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/fijasorenomafikizafuwibof.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9b3nfmvdtaki135024qqbvjat8/81930370791.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/95fc6d2f176065b96ea8b1ccbbb46781/84519393390.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/87009375294.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mupikapuw.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e2d03f62b98bfd805b64d399357c9645/52969037372.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/fefivaz.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/witew.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/11616994627.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/42250598499.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3aa8d6bbb9f480394705dd1c992d4d02/vavukijolotumivufodo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389b3c5fc1---68706233548.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vokuzezin.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/45186266741.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/nelejukawujolapibanan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=esab+welding+filler+metal+data+book+pdfPDF link annotation
    • 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_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 18124 bytes
SHA-256: c6ab89d309a9a7358fb69c8f370aa70a2d178d9bc425d473864c3711f2bb16e4
font_01_sfnt_off00015c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001746a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746A 11144 bytes
SHA-256: b6bf819ae29b19b8d5e7241efcc425e38a9927ea32fa55be9d6c47652fb4d072