Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3852d6594fb6ac0…

MALICIOUS

PDF

101.7 KB Created: 2021-07-25 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0fd81369f682cc2c79effd0b6b6669f SHA-1: 587b359259652c358b1eb986676cd18abd930cb9 SHA-256: f3852d6594fb6ac0976b30961050aa837b18ea223c85a4f88eff2cb4d55a7b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8f69366d5d9c27706ecabefb1f6c2ac8/kagudaxezegujakinotetame.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jenuxofirojemekebel.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/371ae62fd0d862b51ca173d2dc197352/tigoregalujis.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/pefiz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853cc84e1d---4186637445.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/471ec0af267fe89e3cd2167e660b25f9/mupepedo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4549232079---pejikutafijetoja.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/tatazopevodoki.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f5763c4e---rolivelaganateg.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc1c00245---61292894087.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9spjjst5tupireo9p0ui2hra1l/16289519553.pdfIn PDF document text
    • https://bem-sa.com/img/file/37886633797.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076418dc6c50---juxibelilazovudenojab.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/26100843933.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/puguki.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/96915339475.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/449180a17ddeca06878db13b32bd9180/xevufegejatew.pdfIn PDF document text
    • http://aimic.com/userfiles/file/62009038839.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c947b163---gulizoxarufofibomefaluva.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d33df9301a107993fe1b378281055e69/milowuxixunexu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/llme3spjsqv8vhfjdk30mdqr90/86595714679.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1e68s8s2sfomokbd3llgf4ju4s/zopavow.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fd701ce39d2e3e5ad6abd0e3ea5fa8e4/vowirotonifedusuwodub.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/95804967176.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/63800955946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=libretto+istruzioni+dacia+sandero+stepway+2020+pdfPDF link annotation
    • https://www.youtube.com/watch?v=qv8In PDF document text
    • 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_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 21232 bytes
SHA-256: e98268994dbe5696b916bb8a967a4dd5d5e321487628f7ba3d32fcd71c8a5eb8
font_02_sfnt_off00016d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 11268 bytes
SHA-256: 8dc976572c5a48ad5bfdc1982cedd9ca6efc5cc5554a25d7d2c78a8ee6b0656e