Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45baf7587a0eed8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 03:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e46e5ab4dc9019a27d3c0b7449e1cfa9 SHA-1: 16e298ca0ab839b8e95cd35b1351cf057d52838a SHA-256: f45baf7587a0eed8bfda8e9d8e1ebabe3ffb5c44e6b4da515d356bf86bf71347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure suggests it functions as a link farm to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/998665719f14717b02506d077747e730/55711816951.pdf In PDF document text
    • https://techson-cctv.com/upload/file/59282844964.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/96226303866.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/debexesokumuzinobexagito.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e30710ba4---99356030965.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/dapulewipadopowopudarawi.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839c7b77222---gemusowitokopuwexugavirek.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zizozibasixapo.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/39243058894.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kujezifuwawunopalakev.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/16538017490.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/suzuxelugeriziguxo.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/37042384751.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/49706667916.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/12719646594.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/82205374510.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/s2p4ktsjtfbmfgc179ocs2m04f/pirumujizo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19b61ac19---jusiwefaraboxefora.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2b9095f23---powalemujukaxenowaki.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea6ce9889---mowudovisibupatiliwof.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hqp4nn69t9dumqle44ohs67u41/patir.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dukofofuxedofa.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/pugovapimasigidakifo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6n8v02uskdfpfstvbe8ohlup80/daxobikisidabuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=geog.1+4th+edition+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
stream_004_off000120c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120C1 10536 bytes
SHA-256: d6aee40e4a05cc4cb4b77df4eb0426cb7e44d8b82c9d4765e77afefacd75bb2b
font_00_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 17596 bytes
SHA-256: 5a9bd473b6fb74d2950350ad51606c6767040880e79f5dd5c496a6c338bafc30
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1