Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6312290a03f2c8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f99901770a404e0b770f88d66152fe72 SHA-1: a5a46eff873e08fcf3f7554b835c1b1d0b038b32 SHA-256: 9f6312290a03f2c878bf161c74ca82bf40f1be5140a8043ff23a435c14870f94
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oniceh.ru/uplcv?utm_term=pdf+of+class+6+computer+book PDF link annotation
    • https://mysmartedu.com/uploadimages/files/jegifirubibujaxu.pdfIn PDF document text
    • http://sushi-belovo.ru/files/33074204223.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5b769dc5---61880978938.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1aee1572---3647391502.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/tegerolonudug.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2c01aaf7a5b101806966a79b151cc66/vamiguxi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/digariletinorekewekewijep.pdfIn PDF document text
    • https://coil.hk/upload/files/fasosozagivifobevuwusifuf.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bopopi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210822105318607.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/39832293192.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/18341335873.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/15394337.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zuvarebixagaro.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4d8d40f1---81764904034.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4c7056bdbc7ffb9aac2763c256b5ee39/59232748555.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bed7c1d070d---zolonukis.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6843a1f87ce6ddccc956c06ddfb57dd3/sanipakagafiwidemag.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b5da22feef218538bed31c4bd745ffb5/75998967692.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/73694586975.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bd19732ee44a4dedeb1acd3f7300b0cd/37758602556.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nosalise.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/57990720841.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95dc3f146---75091699766.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed9a1daf1---87629894567.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 11084 bytes
SHA-256: ba21d24b2c609c255e7e88b866f39d18f6f55ce085edb71773883820b92e3d85
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 17316 bytes
SHA-256: 3c9d5f5cbfd4b60b557daafb56e1a647d3d708fdd7669b388cd45f66d99c794b

Open this report in the interactive analyzer, or submit your own file for analysis.