Malicious PDF — malware analysis report

Static analysis result for SHA-256 3644318487422e88…

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 09:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9569334687f070bf58e18b3f0e6a448c SHA-1: 5a84c218dc9c7766db04f95db6592ba60df2ec62 SHA-256: 3644318487422e889ef89d9708cc6c5b3362bcbf3d8b3352b51c93146b2ec8ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ipmarketing.net/userfiles/file/64119111047.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/27884255042.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fa6e5ff3f4cf92846b3595ffbc6b591e/46048621027.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4f62244c66f4a087c38213fa1fb79829/61439911478.pdfIn PDF document text
    • http://vo23.ru/upload/file/7975525170.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610295ef816ae---zazogu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5fd2b99b0---vifeladawepilikiv.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f627043f59---93285747200.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/536c7a66b64363f29cf492b483ba18a0/tejorofudeven.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59604a716---vejubamakabuzoserarulo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/49b1b129b014de0691826be73259409f/sojutumatimuvak.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mumokeb.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/pijaxesanuvujiwesol.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jlc1r0f5mr0mtnnli6f89e2s17/48849547458.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a8339db586135616cfa7958aeacebed3/57910231819.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/004bd575ea1730e1e915a714150ec2a2/72994452261.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/52154801265.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/tizejepinapikoladeteroxik.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/leziguzofezakerozaxa.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/96737772188.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///64758762669.pdfIn PDF document text
    • https://coil.hk/upload/files/sexure.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+meaning+of+admission+in+progress+check+back+laterPDF 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_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11292 bytes
SHA-256: a639948a3a912c5c8947a45e04e770d4b91a6da4d095780bffd14107d5784c94
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 17068 bytes
SHA-256: 6bd6bfbc91a84ea474a7e3a15999b16c2b5b5b11a3dd607d2f05b809a7100e91