Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb6ac725221e640…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 20:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f19b77521e9c020cebc474ca145a025b SHA-1: d8b6296bfd12469ad244c6674635e763ce05574e SHA-256: fbb6ac725221e6406e04a57b52a4bfb06e41e822e979c185bdd005513fce29fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress uploads and disposable hosting sites, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URL distribution and the 'link farm' heuristics point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fosterfreezesantarosa.com/uploads/files/7061000681.pdf In PDF document text
    • http://dgkno.cn/upload/73725178821.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/70532776653.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/33890595220.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/20512148520.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51925928950.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142096c369c3---18669022236.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kewefexozigemezugusobe.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/wufewelevojusutebatade.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/kijasagod.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e57fa11d8---suragetekowaxamatizuludaf.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_024715.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/91601924131.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/nonolakixemawo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ijlejt7ufubh8ktvsi365vi7il/87673992535.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be53db38be57aeadf3933f1d6bd6338c/tibeletobofivubunepakag.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/20067266259.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/ferulilezulukab.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614444b7126cb---nuxinapineze.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/dumafekoneresixezetileg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=melhor+app+de+montagem+de+fotos+para+androidPDF 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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 19792 bytes
SHA-256: 2e618800b6a92a04ebabea2b6674f12627e9d0f36db065c51433d36b21ddca03
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10940 bytes
SHA-256: 9582b83ee643f4bb2afead6f44e6928413da0e058c7e32012bed85f49b457234
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.