Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c9eb2abd8a0206…

MALICIOUS

PDF

76.4 KB Created: 2021-08-11 22:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2eb5d32bb577600ce0ecaba84ace9b6 SHA-1: 834153e9b9a7da1ea320b773a3cd384884b10a91 SHA-256: 19c9eb2abd8a0206a54845606d89f89be89bd01e485047b818ff9417ee655ada
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/63cc4bf7829a367bd6a0c54390eb8e20/woremezim.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b1fe326a75ad143cbead1921bd2003ff/85013307637.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/16081239747.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dca07cca---6157557952.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b004945a674---liwaxodesumotuguwe.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/wulisazope.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fugajopukimigu.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vifir.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c79878c92---gefebetizirasetodizixex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/001191aba27ce8f6d0cb305d3429c4fe/febasolatiretunojefuji.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/78495602059.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff19f8aa29---batosowolasibubog.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13ce989da3c16691832667be2028366f/wuwogibe.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sebokeb.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/gowuvawemobif.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9b8995ddf01dacdac270330950333578/zebukuvironupubu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/661bcc951882254f5c71de9c8eec040c/lafuru.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/93772073520.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c54071b0b85001ca97fce1bb986f84bb/xabitegenewowukakitutovu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b51233aec11---79722311466.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1f8b3bdc14---wusanefiteza.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd12a7883---rojinivitivewitanatijake.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/84172621742.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/38467292971.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq1k3n8ckh5gpon8di3ackagb7/71877294675.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293a9535b6---juwijatoxonegape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+vehicle+owner+details+by+registration+number+onlinePDF 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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 15996 bytes
SHA-256: 97409d8c184e7784eaeee4f144eea0cccee4492e1b452d2f3d4a3320c679d218
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 11420 bytes
SHA-256: 7fdff87ef020cb099aa0bc5277d7531eb5d6fd551d2d36de82172d40201d9131
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1