Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1a8d6185c2698…

MALICIOUS

PDF

78.3 KB Created: 2021-08-20 10:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4db75b4608410b91b21eb8f0f0c89a0 SHA-1: a9733406d8d6b6705d414ac23f1d7880cbc07a45 SHA-256: f3b1a8d6185c2698221ceebebba43aa9ed50b4d93f1a9cf1dc4793797a5858b5
96 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external URLs. Several of these URLs point to PDF files hosted on compromised CMS upload directories, suggesting a tactic to distribute malicious content or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious.

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f171dd498271781f8b4db2c396424383/lurokuwej.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b225d7892db---83211935211.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/polikogor.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/32478476172.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/51898576150.pdfIn PDF document text
    • https://o-dance.com/upload/files/jenaxezo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/cd497b56e666d8c5f8a8647aec00946a/tovuvegowivexuzevubi.pdfIn PDF document text
    • https://tavio.ru/files/file/nonovevak.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/32034596767.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zexawadik.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1333368300608ec5773f7bc.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210712_8CB3CA52FD981997.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/sekowabikijup.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c8c26e2fa---rifumodek.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/94345266545.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/33519906177.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b4d896a732127af65ae693cd38d984dd/11903779213.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/c21q6j12tpaifccr8kkt6i8fl0/tunizutaxukimaf.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f85e3d51baf02863ad797ec87711fef4/munob.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/07f84ad2457e59e2ace472e2adc310ed/36733536554.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/gejibigoz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0919ce6e97de9a6b7cf3ef407540cb87/79211262632.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/79363364903.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/83521054771.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/demosonijewuzulidaf.pdfIn PDF document text
    • http://sy-smile.com/upload/files/nosudifetikumufagelikofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=can+i+check+my+vin+for+recallsPDF 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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10808 bytes
SHA-256: da1a49edd2350f57977356f09901502c2cf6fcd820cecd2e5910fdd5e0050b97
font_02_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 16428 bytes
SHA-256: 59cebbdc78110885b02abc74c9420d52220b3322a0746e00af20787fd66a9dcf

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