Malicious PDF — malware analysis report

Static analysis result for SHA-256 4319b7bb863ef510…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 04:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8c68286df82e215503b910e301d05e8d SHA-1: 9a47da15d3c06ed0bfa40ad2400f566d37f5fcd9 SHA-256: 4319b7bb863ef510ae0d91ca5ef0938d5b2b344273c9ae97f4ea89bc7e8dbe51
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608125935bc5d---nonametawozugu.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bccbb25688b810ef3f9d423b6f761c8c/ginawuxuwitumexilijaxiboj.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161250e7d8eced---45613555972.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/87622663562.pdfIn PDF document text
    • http://unityproductions.com/upload/files/15936741893.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/pinokaxos.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9b4a78139eeeac0f2bc18b54034479bf/vakutonok.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66352524437.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/35928698542.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/dobegojirubotizuzurof.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kuxeserumunejapovonozat.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vazope.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/lixakolikabevedevuwe.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/in9i10jct25g99homjdeler6l1/sodaf.pdfIn PDF document text
    • http://allier-genealogie.org/File:/radolepafabumovukakutapij.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/60586279142.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/lowam.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3128ccefd---lowekuw.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/setudusa.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/dowizezamonoxur.pdfIn PDF document text
    • https://ivanamihic.com//files/jiruwivexip.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/30191994124.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/ditojogob.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50ae78728e---pataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=giving+suggestion+worksheet+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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10952 bytes
SHA-256: 568708ca05450d06dccacaa717a8c6bb4c7cacf5e449f8cc63b6cfac7ff88915
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 18592 bytes
SHA-256: ebfe6692adee9000d1eb43e7dd281b39d5fc05e17ba278cb81e4e9746b59a21b

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