Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ecfdcf6d089949…

MALICIOUS

PDF

113.9 KB Created: 2021-06-26 01:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9c53a54c784a5852cb17c3975eff5a17 SHA-1: e6683dea86fa84b88b3fe49165963a7c7cfbd506 SHA-256: 91ecfdcf6d089949080ded4f48f16b0ec44a80d301738f8ee9149ec2785c5cb0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://ajivikafinance.com/userfiles/file/lulavibu.pdf In PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/bisedexofiw.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/d8cec847cfcb576679cc7763c9543c16/62856701788.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nexex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/79b09e3c2178b513799aafc6d6fc2314/89433726392.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aeen75des42dr4c28gfuki9vn0/34348255261.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/wukemijoler.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k1eq17pelpota9nbm01g1vdcg3/refesapemibaxaxugepiw.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29a2a1188260af427bb640da521d46f8/46723855360.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/visogolibe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73ebca4dd---dufenorajun.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pgsi4s432gasl5meqp6n50phh3/voxamibodujagi.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/10300389299.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1e10a54f---35589567165.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01ef7b6c4d171fd42e0d7bab46d609da/febokebok.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/duzisolemipulixodewatax.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/bavomimimanupibamo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/pesilarabakexifu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7159da9b1fb9f5c652e9161e5491ffa5/60696059351.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/57r8ug6pj1ubf4jj5hlf4n6e00/44365490642.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/nepusibuvusepad.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/26323986692.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/xajobagiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+pedestrian+in+englishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018c11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18C11 23380 bytes
SHA-256: 4063e1e88ce1b02481c0ee6eb0537c2dfd26a6735002b76012c840b7a16aa408
font_00_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 5920 bytes
SHA-256: 9025ea79504c0a64ef745cc9a05efcc670e93ed79a409806bd5ec0b2078ab13b
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 30880 bytes
SHA-256: ef5d7d63e5d607f1fce41967a0690e3da70bc333c5fecccf6d6b9fc47677ae5c
font_02_sfnt_off00015b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B81 10768 bytes
SHA-256: 0bc00ffe882b4dca64928dcee8edaadbab88aa0f8cf76feb7f5c4b385e159d6b
font_03_sfnt_off00017400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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