Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeccffc6119e953c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95e9abba8df2a4f9fef4c30821f84514 SHA-1: d0fc79336ec581d99cffe95cbc410cb5cd72c58e SHA-256: aeccffc6119e953ce9778a69631cb2fe23d20f4ded49a30ed48a8e1ce26be069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it's likely used in phishing campaigns or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=determining+outliers+worksheet PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f0bb6bea---tivabobuw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611830a4ce831---xadume.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/xupegifesexibu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/dokiki.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b0d02a21c888c118da813927e5ef4ff5/613268427.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vobawabux.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zigom.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/htskjsdvbvenoc7pci32hkuln2/61185764999.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/jakaxizanunumiwidaku.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1hunq53nlelpkd7uvu2ln59sg7/22490133005.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tiwim.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb700f183f---jijidozodivukul.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/nojixazikezovekavatob.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fipiverixisabopivufipike.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1f9594bd09e1e747015c57206d597e0a/pefivurumipikatobukobo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efe148073---pamilomupaben.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/garimupoxek.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/16558650002.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/mabemonojeleguzemekuto.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/72669105823.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/mipugedumawiw.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/mufuz.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/jekevekisuromow.pdfIn 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 17688 bytes
SHA-256: bd6a1f0aac1a866446116bf86601100fba11a76ca451c492f6903b452847f23a
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10672 bytes
SHA-256: 418c87feab50b010fc7aa51c750df9ef7f3ea16e61c9d73a53fd7430ff6185c8

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