Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc413321ebfb8dc…

MALICIOUS

PDF

147.7 KB Created: 2021-07-22 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6eaf608da3213a996a9162b57584a042 SHA-1: daa2e47de74ef1c3f4c63914a580878e87d3c061 SHA-256: 6cc413321ebfb8dc11933edbc58316cc08e0b95b36e545c12b5c0a2ed261a37e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings strongly indicate an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bce68d9da---29990103764.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/relidupelinagut.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58058141155.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/lesuwavuzapa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071079765771---42474044760.pdfIn PDF document text
    • https://tipresentoio.it/images/file/remugofabilekojefure.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/porewefidirifunivaz.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/92820210438.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/58972456383.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q264cd7mdq6cb5ecusrjlkm0lh/xovovikuzixekerus.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/30408426530.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pakawurosu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd2e3e366---runewakeku.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/lodumifipuso.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082912b55aaa---pobesevutomosulerisojufat.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6b07571f---sukibemuzefap.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/piwepirezu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dibijusot.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/8ov0nii66qbf15kf9f0tvbfr9o/16433376312.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/15217626778.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/66491522683.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf9f47009---73110972808.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uecemjuk04mmh2i3ab3clne6e6/lufologigegupexivesa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/868857b0a9d61c6ed0980770236074b7/12899385777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ashcroft+and+mermin+solid+state+physics+solutions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D769 20480 bytes
SHA-256: a992adbe2c175685fd725502ec05e6191726e7c4e283c9a19b08df109c067025
font_01_sfnt_off00020b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B9B 11080 bytes
SHA-256: 6e82cc967ab894984cff3eabc9bb348a8cb9f7abe636fb93a18f59713c174ade
font_02_sfnt_off00022548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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