Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c46766d0e9aadf0…

MALICIOUS

PDF

80.2 KB Created: 2021-07-03 06:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a823a0d03b8d0f363fcc8e78f82c0b34 SHA-1: f4311dc5d4690f944025dc6662648c434124d430 SHA-256: 3c46766d0e9aadf0fdf2d886f2539039e2d8eec6ec57748082e99e669d986eb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file acts as a link farm, leveraging multiple domains for its malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0f92g0hrr4bb02u231tcnmg7lt/74020459865.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b68515048bec99f5b6aa7c93c6cae9e2/53253463763.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2c2d0ecc---71724080806.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/dotajusomepugorefoz.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/milejezogukanuv.pdf
    • https://twr1115.net/files/fckeditor/file/getafakekolazinoj.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076762dcbd5a---xolafutizuwegojufodij.pdf
    • http://mikailang.net/userfiles/file/20210606174359_2068326223.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d4bd32041aec006646425fc734aa5fe/xomiredafaromipolowalogu.pdf
    • http://nesthomes.in/userfiles/file/34066940896.pdf
    • https://appfacile.it/file/74570845680.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5722a901---xofizesip.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1g3e05a0fbf7oui7thhb293vi2/mulenebeni.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4aa5bacb9e2a691c60a244adbe347688/16125603858.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3bc56b16---jedejiwejuxezi.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607360e410ba8---zejigino.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d145f9f4---bivikoxunajuf.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e93d1f8ac507f2502186ab880a12edb6/65519260831.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/11492748700.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcdd9a89f9---28428250892.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hps23r92shparu9mvar2ld1lko/pidelugojo.pdf
    • https://emauto.lv/index/images/up/file/wenonijaxopimawexere.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091972c261da---39811144310.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210529221737.pdf
    • https://creteservices.com/FCKeditor/userimages/file/32796862274.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+does+central+angle+mean
    • 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_off0000d429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 16792 bytes
font_01_sfnt_off0000ec40.bin
b2a9521b9bdfb8493ee88bd15fda6ab03398bc8ddf466110cb83983a7fbf1328
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 10720 bytes
font_02_sfnt_off0001047e.bin
2ca500a43931ef35016d39a4dca9cf6c144e3b1a91783d03ef8263107b7c3f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 17200 bytes