Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c3ae06d27055dc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 16:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60c9210e6d146d383a104d83f6cb25e0 SHA-1: 851d984cc20adbc319134536cbb7afff5004b3bb SHA-256: 37c3ae06d27055dcd6a57f66103cc92344ef9a3e80630fcba89f8f814ca00aed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jk6hf7i0tcbq7vpi2063kkpsao/saxatok.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lumolumefuxizedokujid.pdfIn PDF document text
    • https://inncredel.com/uploads/semufilejavojubofa.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/54288865732.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/84324309494.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5b944f5208bc30d4249c0ca2a005139f/3390487052.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/58573578766.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/pilizebozibe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69ecdc1c2---zuzanuvoras.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/lasimejigumuloxilukudor.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/gomazaluwivuzegofujexuzu.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/66614516021.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nenowovaxubopamibav.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607710ea7e21e---92984322340.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/daxexozi.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/44924990563.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fibodetusunosiwokunilowej.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/65885240818.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/82157243625.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6feb6768---jixufofidijutuzogib.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/viranibiwarigazapik.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/186849209860ab346400df8.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966f03afcdb---96656963336.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p0n6ku543uvlsfunr0kg14sakm/sidufijobasunofom.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ff1929e5e5a889b15502e65aea994c5c/326591325.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/5364184214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=animator%27s+survival+kit+richard+williams+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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 17884 bytes
SHA-256: a25785bf852bffb7dd581033cfaddfcf47f69f0d83fdbbb41647f61a630d1e38
font_01_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 11112 bytes
SHA-256: a7a5071066ebaf3164631ed9e0f9ce5390cd7b470fba7b6185f838778a0f8b5e
font_02_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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