Malicious PDF — malware analysis report

Static analysis result for SHA-256 199d40858e489344…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ca0e3ef6d7f5cec5aeb36be1270120 SHA-1: 13b12d294b6eba72095e5a3d543f59590fa4216b SHA-256: 199d40858e4893443c99e66edd3e1b73192d1f99317f7c4cf6167b8d57435e2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The file also features numerous external URIs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cbestdesign.com/ckfinder/images_store/files/wogukos.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7113a54f3e65542c3e6764d811178e5/fafovubizexanijidogozu.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102d53e4c7fc---zulefinatowulokakugujudos.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608535aae767a---79934901029.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v0jmdktf59693c6fbeg5kj3l76/44891609532.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd06c1502a---wiralinufusenemefetugom.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd246eaf2---manuvu.pdf
    • https://pt2-turbo-j3t.com/contents/files/gikesokije.pdf
    • http://zonazero.es/userfiles/file/22205151473.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/lepufetakaga.pdf
    • http://rongqichem.com/upload/files/90324852472.pdf
    • https://csodamalom.hu/files/files/tisawadelu.pdf
    • http://akinmedical.com/uploads/file/8994171855.pdf
    • http://twfbs.com/ckfinder/userfiles/files/44781489218.pdf
    • http://slpclassof67.com/clients/45391/File/vagugip.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/52997455962.pdf
    • https://arvikabc.com/images/uploadedimages/file/fuzowukufosonebu.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/22795f4ae435fbf26e554635a245ce45/51981551009.pdf
    • https://srldirect.com/ckfinder/userfiles/files/76888977837.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d6e49ea777aca7b2f4736a576710f74f/jovudawolopisepuk.pdf
    • http://niszczeniewaw.pl/userfiles/file/70844555516.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0172807b8---25894768049.pdf
    • https://alihuata.com/userfiles/file/penunelozexilakojajobi.pdf
    • https://austdoorcaocap.com/upload/files/bejexubexemogajadazanij.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4656f9518390b9bfec7fca9af98ce636/83842627927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=france+population+policy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b821.bin
ea6f5bf2c1f4c97d8a240e7fbb46b48c4840deea12c55e1dcbfec9a03508b3e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 10636 bytes
font_01_sfnt_off0000d090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 16792 bytes
font_02_sfnt_off0000e8a2.bin
c3b3381a278d83f22ee878a6cf7280f2fe8b96259b95466bcbb57eba29be5ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 14736 bytes