Malicious PDF — malware analysis report

Static analysis result for SHA-256 1499885e89df3052…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 01:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78c93c8cc37d0a319c5fcd0ab6614844 SHA-1: b903530a8844d6feb5f8631cf93b9f5029f68eed SHA-256: 1499885e89df305296cdd6ace14b20216753489c57422c3e776301efcc196667
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, indicating a potential attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://brothers-music.com/ckfinder/userfiles/files/kowogumitijukilikizo.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3464cb01---xetebebeme.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/31965554942.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6f07018bc---mitimiw.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c88a828cf---37721767458.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mififo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/s0hitgru2oejohde93bma5cfig/sabimejelagemiku.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/jokolut.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/37955827263.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/pogonivasegagusifumonete.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/paxodezagalim.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/momofuwonaniganukax.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611cd2f933---90640051679.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdfeb5935a---gavixuguxas.pdfIn PDF document text
    • https://arerp.kr/data/file///vexakizudukij.pdfIn PDF document text
    • http://e-sportis.com/images/upload/pobojoburukumagesi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rnn580lq6h4mpvdtd77vke8a0b/gudunesug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094f2536465---91074900473.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9a46c0a37db7d03b5b0fb379ebce6e84/16772056127.pdfIn PDF document text
    • https://songhongresort.com/img/files/xarolegolovedapugeraki.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zepuxomew.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/mozozulur.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124eedf3cda5---69930894463.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/6117741836.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/nasarenadawijuken.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/42272720742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nonlinear+adaptive+control+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_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 17644 bytes
SHA-256: 9f207dbd6302c2c76d719a1d2481da5039d7d5ed2632539abec9f2188711772a
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10488 bytes
SHA-256: 6b4a5d940b4f47ea7f8450f0a68f47bc7cf8d724637ba50e33d0f616801f25c8

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