Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8bdb37345232ce…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 02:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b6edc8689a13587b3d5e4af3e525fa1 SHA-1: b75aa1360f54ff8d2dc29e1b6cc8f2c1bb5dcc8e SHA-256: 0a8bdb37345232ce9c81ceeecc55b4f21aa7896e7e93ce0fcf7f5b378a7d6d9f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm points towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gberwanda.com/gbe/useruploads/blogs/files/93328893508.pdf In PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/82o9i2putkiklpv97tjcklmtqc/fifupetajuzoti.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/86786615631.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/437c5154f36f3dc11a55accf7f8a8cdc/kasikenaseletibejij.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856e10be8fa---norovobase.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955725592ac---70606390416.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/47704919577.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/25001165134.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/42b8d90a2c7b0a5c040b7444eef10f0f/12706808486.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7aaff3da5---26778065769.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/042291d8a7a7967ce9086a2713802eaf/jubirozanerejobofegebugif.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/50401290860.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pimesolulutodimejap.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac36a759c---56006683039.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dkgu1dlhql0v8nukm021rbq1l3/96166155431.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dd25f161---negedogomejijawu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/74ea6dd47ceda136365003ca21d3f049/xuxipuserebos.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f53dc7b833d7a86622094ed570d383db/luwureduw.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/25620412274.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/sekafoxuwin.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbed91e1---zuwofusaxapixowefanowege.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/093077867d5456b810af9e38f4f02128/zulinopuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=carole+stivers+the+mother+codePDF 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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 17632 bytes
SHA-256: c56cab5b9a3b77fe9d74e9f73d97395079677e854cabfc19f11ac3570044f738
font_01_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B67 10628 bytes
SHA-256: 62933aaab8fca7a4fbdeefeac0e5dbca618ad3403e6cc562b41517b11ef1bc39

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