Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaab4765d7b9799…

MALICIOUS

PDF

70.7 KB Created: 2021-08-22 11:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3685b0b12a91b17b495b698edc63ece SHA-1: 5877fcee777cfb072cd3b8fc230b4ff9b29df477 SHA-256: bfaab4765d7b979959c01c4af92dc05d2d83e925c0c2ee6ef327ac226421e1e0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9475

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=plate+tectonics+study+guide+worksheet+answer+key
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8a8a2a2fbe9e704787077c9486980b6a/towakamidazepazikodukifo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/14937c579ae0368950aa1263697e3332/57366630480.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74b061a3c---477273138.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/do72s9k2nj28em1j4kt1q87f8d/43221820914.pdf
    • https://betalinktech.com/blmedia/file/84650551677.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/rusokaruru.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525135438223008.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/papuwuzepukakife.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae422124d6---66301288075.pdf
    • http://holidayservicemarsala.it/userfiles/files/57478107462.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ada5f582cca023d0d1201faf574f0760/lewawogudadojo.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c45bba2a3---kodebusodotosu.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/velazexo.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/fijemobiporuwaweb.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d231bfdd---nibipabokedifimamadaxab.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0igeqtea0vno221drklqdl9svm/56384965989.pdf
    • http://qzgj.cn/upload/file/lodolumumalowirowexuweneg.pdf
    • https://briljant-maleri.se/UserFiles/files/19747624682.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134879375dd---kapavepakikuvokajawi.pdf
    • https://hoavily.com/uploads/files/29782783096.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/digugan.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd8cd5f16---mubaz.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/19924700859.pdf
    • 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_off0000c6b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 16792 bytes
font_01_sfnt_off0000deca.bin
b53ebe1f4da13f17329b1914711d9745c7f098fafdd919224b689b9c5e977b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 11044 bytes
font_02_sfnt_off0000f854.bin
5605f8ec17223c6baac530ea4837012b75a9530782df28986f302d188f65003b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 15148 bytes