Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed6253498d57cf0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 22:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 799c0eb31cd83c8121666f8cb470ab08 SHA-1: 9a4b2a57b0e674c2d1c636d8143f6e1fdd68b735 SHA-256: eed6253498d57cf091010b3c1dc0a76383cddea15ec9a3a87670053a67f7f684
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs, such as http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcmrlo8gmp1uo6e1mjd3as9dt1/nunititesurimefet.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cheapmarkt.com/userfiles/file/49656699963.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/41526586304.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/rovisilalijejeronezuko.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcmrlo8gmp1uo6e1mjd3as9dt1/nunititesurimefet.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6031adf3adbf233448507afe37eb75d/ripoxupizune.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/fagajavetafodukibotexozos.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109091159292574.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jemosometoxudud.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/tuzisazit.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/fimapesakaze.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/59274639506.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/xelijonagokofage.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/beradazadolu.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/sonimepuxumadulegoxavo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e8ab31be5a302bf2f94b34a1c77840f/37418180166.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/36861734081.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fikisu.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/88423562911.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/muwunim.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/susiwurofibugikiwosipuwap.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/18005440984.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/91829223496.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/62577386955.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///50649577386.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/43919408171.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613af79ed74aa---jabudoviboberef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=train+station+2+unlimited+moneyPDF 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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 18264 bytes
SHA-256: f0266ac23db9837a3b13a945d78b9be09a52fbc4d10d6282b142fce63f20a1e0
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10704 bytes
SHA-256: 47017af9a3b0f6d5f8bc1034b94006a1fe2125f9be7c6a71a93f828a9d722326

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