Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf8a2f69a042c04…

MALICIOUS

PDF

93.0 KB Created: 2021-07-20 02:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c935c5e3951c33c70c4fc8c603b717bb SHA-1: 97b6549e0a550e1c210252bda77a23497056fd53 SHA-256: 9cf8a2f69a042c04feac027d095b0c9460e8a8f20cf73a30c41f7791c7302387
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites using the 'formcraft' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a8e9c030---62755695140.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de421e0d9d2---45594941736.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/zefuziredokekugi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ad10a57b---tofapazisixaviwobaj.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/120dfeae79543649a84449b66e6fdf42/gogimimimawulutoluka.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sakafelexinabupirur.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7ceb1cb7cc6678e2acc99a92114d1357/41200567659.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b436c14f549---46332332810.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bf7cb92aa6b1f5111f5da18c72916237/kugewarijugejus.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ef78dd9---rewinabuzuxagukem.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zuzilovipezosawinofarevo.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/jenegibapu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3e741ea3---25435616056.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/sugekezomave.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64504602686.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nurozagodome.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e9763163a23b27c5fd33496d3caeb891/24908319889.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b252e57b64f---97959380487.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/vifatasexujakuwifoxubitu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b62f39b59---fasupuvorutuwi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rimawigodupepujujagomipej.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210710195229.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tcknpalkmqnskrbskc42kv1l72/13575617148.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/zobinen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=recruitment+coordinator+interview+questions+and+answersPDF 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_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10928 bytes
SHA-256: 34750088d1383b86dfd6305a08ba4e0454d80d98b4055fc32abc4bcd342e138a
font_01_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 18232 bytes
SHA-256: 1fea19c63d59f605b8fe66f14d9f16a41dec52fddf50b8573681788c3a3f4639
font_02_sfnt_off00014e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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