Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fa57e8ddce3037…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 10:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ae9ee854fa901385faf781f7b124fa1 SHA-1: f95a38e159c01442e4ec9ccff58c173e8a9f6558 SHA-256: a8fa57e8ddce303753ac0e9a58e8d37e3afe58b933728aba32ba104716e7bbe0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pasarantogel2.com/contents//files/54682642530.pdf In PDF document text
    • https://abouelhoulgroup.com/userfiles/files/33369581103.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/584a7e2028610e9754b754cb5af15786/11807433892.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202108151741105133.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/16893e7f924cdc5a9ceafc6e34512a92/dawuvimidazavemowatagi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/33194796257.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kofatar.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ff34e48c35572f78e834b17197bfc54e/89242176487.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9d7102f4---55067685085.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/kazisiwopexibiwadimafa.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/wenigaxupepavefawotowup.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2a4ef65f---kijudamuxexevejade.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/28323236753.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f96ac62b80942fd4e208bcafb1215eb8/dabizosamajizenonufa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ffc7c1da49100aa90c0e0e750ef116b8/72667831990.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/43985514198.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/zagipuxapefabunu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mlvu54u1efl9ddk5fqjbkrncg6/renorafarafosufilow.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d3d67dc---lofotirujoduror.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/29643019031.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d8f889f7686d577c54cc42b6bc437081/bodizogudemesugopako.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/kufibiwireso.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc14106bb---12471513042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=online+watergirl+and+fireboyPDF 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_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 18544 bytes
SHA-256: 6c38a6f8c78e8fdb1e354fcd8204e747fe25999ce53975d929aa9dadb9d58acd
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 10724 bytes
SHA-256: 85f258f423a1618e719ff3a7c571c359107eb7a03d292b9ff50129f9d4594fa3
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1