Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1252f1f3aaa310…

MALICIOUS

PDF

88.6 KB Created: 2021-09-11 16:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc7f4750273cfaf2459158db41c45980 SHA-1: 1dc4a5a86cf84866e81c8811edf9e1ca988a997e SHA-256: 8d1252f1f3aaa31098fab2513ddf28efcac0d38438ef763d115318e804e53989
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' shows links pointing to compromised WordPress upload storage. These findings suggest the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://warungmimpishio2.com/contents/files/kuvijosaxaludexafiri.pdf In PDF document text
    • http://mikomisushi.com/uploads/files/wutefobilegogoxolonunokil.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rorodexug.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/52495412202.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/59615097450.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161356957a2c79---83721130658.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/rakuwivukoxukebef.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/katinori.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/sutumote.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/56732033527.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/munukaxubew.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/wupagatamavajased.pdfIn PDF document text
    • http://quranday.org/userfiles/file/wamubo.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_8D4E2408F294AD73.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/bujubugavinawo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/78516916489.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/96701591810.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/lubagizofidepujaw.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/79263841834.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/mewivoxujenoroxufupe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a906ec17a9---reluvojijebaporifujam.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/wigemujemirejolukaf.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fd7fc6804ac558da50fa8760062a7bbd/bumot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=elements+of+discrete+mathematics+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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 18552 bytes
SHA-256: e83a784beb9cc26c514747aa097ac041290439a465de60f655f9e5c46681ec7a
font_01_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 10868 bytes
SHA-256: 34bfba7c3a91941a40f5ab6272c95ff0e649fb5e165f6cdaed6573d155c157f5

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