Malicious PDF — malware analysis report

Static analysis result for SHA-256 e443c50772518bcb…

MALICIOUS

PDF

90.0 KB Created: 2021-09-03 00:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da0e1ea14cc9840cffad6b22fae34849 SHA-1: 7d00ede248808cbdd57b70a381d16704cfa134a1 SHA-256: e443c50772518bcb3a53ba257649170c433cddb37a5765f36b9e9dcfa3fb21ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c850e6b0e1---saveranolizujasidopi.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0e42cc87---63309166560.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16113e8b47c8ee---50816577312.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/9096482949.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/lawutanum.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741d2d91190---xitolegiwukojafoxa.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/vumapiwubabepobiboku.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nunewaxelimeles.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/21247295479.pdfIn PDF document text
    • http://guitarenko.fr/img/files/53555351626.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/80296388450.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/81811976640.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/weretogudodoxi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/53533407465.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210805_29B112C8465E5FDC.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/31600357384.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/43690097040.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22037602365.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/70078613047.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bea6548f---monolexinufimajerorulakok.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/299ebcddb443110180144a448e177dec/25470042223.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7269260a---nolupalirunosifufifomu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/42417748355.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/fexew.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/60110791834.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/17714098298.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607320594dfd4---40034318828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pnb+metlife+super+saver+plan+brochure+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 17712 bytes
SHA-256: e3a29fc95dc2d1cf499cdf738995a7fa6825073a60dea112bc3b8ac77d057f09
font_01_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 11192 bytes
SHA-256: de840ff502a830619dd29446d4370bdc299d39a4fe2849ac18c9c33c7aadea10
font_02_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1