Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dc7c979d91aef2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 10:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c34dec9923f44fc6651220b2c03e6f1 SHA-1: cccce77576cd8498b3278b163f0e61da941c45e2 SHA-256: 53dc7c979d91aef2d4eb3ed5c6a0b8c2492bef882d4d27c30f6f70e6110d0a09
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, suggesting the document is designed to lure users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://marymo.ru/uploads/files/61290650456.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608af66651007---lulesokamujirilefez.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/44966608884.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160702d6fa0504---24444716890.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/87f744a1db5963e977b6c7b1a112d70c/95321914012.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/faporofulozexojamifam.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/71758241641.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/wuwemoxivojav.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715babef196---vomabiwikiz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fa332410---risogafa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9aee786903a96fc355d553985a3d0cf6/37393363591.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965f2229217---385731293.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/vepomu.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/lazivovenolowafewesef.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c7f15bc4---migofunorepakulodajalor.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/c7e5ac250781535bfbcaf5c10f1055ce/26742175102.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5dca0afb2df0d89ee85c1a83982eaaaf/44056869876.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/54781195629.pdfIn PDF document text
    • https://birudongker.com/contents/files/bezasuzisokinuvifokob.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070889c2e7af---15173855971.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4a47ae2edd695d3d9e15b235b052b1a3/80534690509.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9961d050a---67492722687.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/wepumibumoliv.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/63629600378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+manual+brake+bleeder+kitPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf4b709f5---67709322848.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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 17188 bytes
SHA-256: 9409b70416b04c90b494cd3dda3c7fdf88220ad333c192ada3bda2ba725f9aaa
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10820 bytes
SHA-256: 2fa9176e9507fff54a5361df0212d4816fc82837bfe2a3f7741cf9e95d978cb7

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