Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d46667c0eaeaa22…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 21:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d3021ea5be37d7fcb36d55ce96eef59 SHA-1: 2041a0bec230236787381dab92f10551212206d7 SHA-256: 0d46667c0eaeaa224730cfd59056779ba5146267513abe3324905763531069fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=graphic+software+list PDF link annotation
    • http://snap-drone.com/userfiles/file/goxasaromuveselusekifo.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/66649679364.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/sefamevibamuxukedi.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/najumoxomarokatez.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/67929722919.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fcd596ddf0d1781551ad084462817fe1/32313250418.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/56795263298.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/30632769350.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/zamiwawetojokixisewigu.pdfIn PDF document text
    • https://birotex.rs/images/files/jasulirosuku.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/an11t18ek87c6m0mjv63ft4vo2/madusitagolu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead9772632---temizanifiz.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210913_0199FB1D11729DC2.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tebifomatavabofifopuwon.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55557934853.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/2909510429.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81cbd4c04---54049349385.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/60438861663.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f2343a9ccd43d2a292587233692a3d5/misefuvetekefowibujoz.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090430079288.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/folodibuvokudetamorej.pdfIn PDF document text
    • https://netlandschool.cl/files/bebubixubepugojumi.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/97765969212.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/nojetekoragezilezexe.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/62352995313.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 17620 bytes
SHA-256: 4ec6ef608f3267ed504c26fe97e0f6259f7f5d53f050a18da83bcae105c124ac
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 10600 bytes
SHA-256: 833498b7de7fd7a438691b295b461fedbff95db69366a3bef9b4f55a88515f3a

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