Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6c714d66039580…

MALICIOUS

PDF

92.9 KB Created: 2021-07-29 16:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d20cefd235e7545ac97d2f65ecb03140 SHA-1: e9b41a9843d5b60f32f6138abc8f9163b6479ebd SHA-256: fe6c714d660395800470d8c2263bad3a46199b14872bcddd82cab4c1b5a8a87f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also features a link farm pointing to a compromised WordPress upload directory, indicating a potential distribution point for further malicious content or exploits. The presence of JavaScript and compromised links strongly suggests an intent to download and execute additional payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160971d6c839df---38822267823.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/zaxofulixufotisigeta.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082520097894---55941708089.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/sipomedofapidikujazutegu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vujebusevedazopagiwofod.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/tukoranebusozasi.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/pidozilis.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/41380427.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/nilixufozewasu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a803ff88fa5---1084990810.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/221d39f9a7345fb4ab2b94c41bc25688/15945258566.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/kiwisipufup.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/72623917440.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aaa0e913d---24624827057.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b6c49c07f392c8553f604aa228eb3887/sugedipul.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/96161336350.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608200070b5c6---saviterupobotusalu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/bovikavezek.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/45217371879.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gjog6bqbs904u3jf36r9e71nd0/47049471128.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160928c4c9da14---48219068444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=porque+se+aflojan+los+dientes+en+adultosPDF 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_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 17676 bytes
SHA-256: b8371ffd60cefe54ac0830eca0400f6e407aab9f8c75c852ec32fac4870bf1d8
font_01_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 10724 bytes
SHA-256: ce5f7413b16a6162b5048a1e404f668f2e22950239844b282851585045bb69f1
font_02_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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