Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fffed163f2c1e3…

MALICIOUS

PDF

75.0 KB Created: 2021-07-08 05:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45cc0f540556fd85dbe70363e2b76ec SHA-1: 7aafd066ff468b051d8a60bc2095b22a842a2b69 SHA-256: 97fffed163f2c1e3ba361ec9bb6a27accf0e9fb5cf5b6d04c36086b0d9780771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves redirecting users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://childconnect.com/swi/fckfiles//file/kijosubepiworejixutovoje.pdf
    • http://domeinbeverdonk.be/assets/files/file/riwesiwasinogebad.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33940b4eac---73105473506.pdf
    • http://ahkjt.com/upfile/file/68700650057.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7539c0eb4---xusavefekulirufasolid.pdf
    • https://tyeetomsfishing.com/userfiles/file/xuzoje.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094527579415---lowidezakine.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1i19imd4cv4osr4kso5jn14ohv/23568554962.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900171296c9---83865404710.pdf
    • https://m3csrl.com/file/44709022319.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ch7p8b35vfoqg20o3td7ga2p1i/zafezob.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fq8h2beo4tc1vdvdj3vj9eqje7/tiluwowisukawewipode.pdf
    • http://tycoonmedical.com/userfiles/file/33859187592.pdf
    • https://waroproject.com/file/20137636392.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1210a0b4---35697918687.pdf
    • http://se-ty.ru/uploads/userfiles/file/80724254127.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a686f6877bf8fea091aaf555490b9233/jozonir.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/75aa18d16b04912bf439b230063d6760/volurijolowojumaborul.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/refoketavupuwanexaxugurib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+truth+untold+english+cover
    • 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_off0000c41b.bin
4bd4806de20b889a5686899491d97cd511eb2c48777c471cf4dd9fa2f9dcbaa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 16632 bytes
font_01_sfnt_off0000eef8.bin
1bddd52885d61c06b21a1486093d05c0c2eede1c0000eed56b7006acd43f4d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 10616 bytes
font_02_sfnt_off000106fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 16792 bytes