Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e145754019629ef…

MALICIOUS

PDF

83.8 KB Created: 2021-07-20 08:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 064a73bab340345ef526a21095560bf5 SHA-1: aedc651421244f7aee60fd35808b603c18549ffa SHA-256: 8e145754019629ef39f36df3f436451377d3db2f6c7701f1d4baa4781ae29cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malware, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/80pv4sc3gr1kpsotbn9b3vb62j/26716692172.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826997774e9---59912462482.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795080a120b---64311983337.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac44830c14---jezajuzisizozepemol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kusanojepa.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/12192284781.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1v4ug2444tnd8oag7kfoehu0j5/xitosunodogogexagewux.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e51044820---varerodas.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/fikokaduvekiwokibifarenug.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/93271004713.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/31812361707.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/62f341a8304f2e857f6bbead509ac4aa/44143360283.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/kogiw.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/wagurufadukukuk.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8750352d62---solezovekalatigukave.pdfIn PDF document text
    • http://thongthien.vn/upload/files/meriwonopimemeteru.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86606aab44---wigukizamitegamoweginowen.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0732f7884a2887c094386bc194657574/45079602219.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62a752415---91766491984.pdfIn PDF document text
    • http://domplus.su/userfiles/files/40197302851.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f898546a80ce178ea12b9ffb48c59de1/91913962325.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/gakesenurutowonafen.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/numaba.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0k4rs5c41ul0865pbd2qtqqqhn/95976752024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+faded+mp3+instrumentalPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c425.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC425 19360 bytes
SHA-256: a772aac373276251dd84a68dd3883e53f706ed828437f2d651d549dc29902131
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 11016 bytes
SHA-256: 18f60041c30a82080330800f343136fc1d43d5a844dc45a9a942fa1596fb2c49
font_02_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 16728 bytes
SHA-256: c5e0462f18ce91d9a01e7e15d58964e6971ebc1a8bf116c66e40f2807378c33c

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