Malicious PDF — malware analysis report

Static analysis result for SHA-256 c834a33da2096d3e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 22:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12183f7545aebbd4adf2e28b7e9969e5 SHA-1: 801b1ffc1b57a9790716993dc414c932e871fb6c SHA-256: c834a33da2096d3e10c299ed03372362d0340aa778ea4abee9d5c01591a90aa4
104 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress upload storage and other disposable hosting. The presence of a 'Download' button lure further suggests a malicious workflow. While no scripts were extracted, the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://icr34.fr/icr/icr34.fr/www/files/files/babusimokadiluwukara.pdf In PDF document text
    • http://hmed.vn/upload/files/nixigunelapenatan.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39133375254.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/juxifajikaju.pdfIn PDF document text
    • http://finchamauto.com/pics/16960727516.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/dobimumojojos.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/6584783384.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbab221cc---vurodekidenatiritupefex.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92682589621.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/20195807047.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/366259228.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613246e5bc368---vesajugemofegedajunasuvu.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/topegowixumaxita.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o1dq72s5fhupf2kgou4rob8gtk/883936251.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-11/20210911193730686253.pdfIn PDF document text
    • http://jar-ted.pl/file/94175820828.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4e4bbbff---50319866325.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gituguwuxiruwo.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/patapolefijutajatew.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e385aeb00e6a658b599e457a451b0240/37805448603.pdfIn PDF document text
    • http://machulski.com/public/file/84497461493.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff58eaf73---bebalolesuvijo.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/94805322049.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gogufepaxepunogabo.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/74098409512.pdfIn PDF document text
    • https://bak.vn/upload/files/73647317602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+new+fontPDF 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10040 bytes
SHA-256: 8b2f767572f499b709446c56562a02618b728b4a40164f6cc1478a8de7351a75
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17304 bytes
SHA-256: 97874d9ebf9a8b73c566ec263ad7fddb996135c784099fa36d88f62fae649838

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