Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f7198f717b2863…

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4f7f0141fab79fe88b0a2d1ca725b36 SHA-1: d45ab5adf60f9cc8767b8e28219c57da0717f4ad SHA-256: b9f7198f717b28633ba56dfb16f5643b7488175e7b53198de190bcb625978d30
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=the+meaning+of+setting+in+literature PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9cb96d8b---kebezerixivebevatu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/75575774928.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/70972119652.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d2ee3250b1a1f6c7299205e65a6813fb/pajusoxopaninaw.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/77b7cc67e2f02ffdc015175bef30a7aa/zosanopidupudexovaxoso.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078327d86742---40522122777.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/980426161.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/74079577921.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sagadixakavozigobi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c46536ae323739762f9b0ad4dbb3643a/noraworivaguwevudo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affac2f0760---44904632202.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098400344065---lomedijujikewelutubulewam.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106230252464863.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jimil.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/201704453885.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/sukavepofipo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xobokuteworipefutegegupum.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1383a6d3e---zuxukugu.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/40493223048.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a693d53debe---29755966308.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c70d51d8c431cecfe9d11ae966a52e75/pilisuriladavuditukepena.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f65e0b59---57932890156.pdfIn PDF document text
    • https://birotex.rs/images/files/widovomo.pdfIn PDF document text
    • 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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10724 bytes
SHA-256: 00ed21911ef5dd5a9e9997d8308aa97c04aa14763c8986199f072a891b46b5d4
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16864 bytes
SHA-256: d13af41a182f3910f5ea9d3bdeb9173d74e8ed87d3644d36ebc6ca5d39ec9218
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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