Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1eeb86d508cbe8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa9ac5b9b64350230d46c2417ac07903 SHA-1: 6295a33d7f06d9327ab3b4ca9143e9c6c1d39993 SHA-256: 0b1eeb86d508cbe82a0c03373a39d5c48347d31bd3c1fdceaa1307e40a1a1ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious 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://coretry.ru/uplcv?utm_term=play+dts+on+android PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/zajuxavun.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210920_94DF5447D987E567.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/modejagebabefunow.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/b4fc1iu9rrgco04pus9a1jhlkt/65968259897.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/35764569041.pdfIn PDF document text
    • https://actorconseil.com/files/file/29287297478.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tisuvuxawobodenitomu.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/pepedatesa.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118685ef51---61737382046.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141de9ed65f0---pesoboxataxevolize.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa90f7e889---45628272175.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/furataxukufolosisepe.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/mewomevutoji.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/91504130329.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/90836580713.pdfIn PDF document text
    • http://ccsl.asia/files/28642973819.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/59199885641.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/lojixadasajisixawekosejow.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/26265299174.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/juboduluvekumavixunavoma.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/98882941277.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ganuzitaxitu.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/91664341076.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/xiduvilaza.pdfIn PDF document text
    • 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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16404 bytes
SHA-256: f574fb485ba880add4535271ab37ab532ead4f58e62c64ed845f35f1bf66ce5d
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 10224 bytes
SHA-256: 75293cd7031dcd1bfd1a16319af75cf2d749b43cdbcc2174970e2a30222619d5

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