Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dab32dade612b7f…

MALICIOUS

PDF

89.3 KB Created: 2021-07-17 03:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0a7ff30eed503f441afbac124beccbd SHA-1: a9e4394d91471b254f4b55d9e8b4ede87098e28b SHA-256: 8dab32dade612b7ff48a1529ac516b7f96209dbf98dfb8ca05974b5fe0ef1e46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f1227157---dazizov.pdf In PDF document text
    • http://fence-alarm.com/userfiles/files/53071019359.pdfIn macro / runtime command snippet
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/tafudusenaxoraxewuruwa.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/81338349542.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5dc3cce2472151b1b64b97493ecae7e5/fogonisomapuzuxemej.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fnvep3m6ns3c14hnqs44nre8jm/duromerebalupewemiwa.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/56793296565.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b162b84ba4e---46649342793.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061807074920.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c4dccec---869079299.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/59635204594.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fotagoniditolodejanilis.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/79471716372.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kvvfgvsn8dtnde759oggkb0it3/kigemokupibal.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608233276dae8---28554109050.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3e2f4256b7b3efa19911f5606a524eef/75382462342.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tasozeka.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3450654379.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/44626218889.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oqi75o7onal1eb788i6kdorvqq/96317273188.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/boletigegajosozu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d3df84737f4acf8c76d9eca63ef7d60b/liloju.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2a810f5f---rukobaresivenumanova.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/forIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=haircuts+for+plus+size+curly+hairPDF 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_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10740 bytes
SHA-256: bc2e89ad76b06528544ea656d15bc89598e048eec3a6e4d64adf9fdc779a32bd
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 17572 bytes
SHA-256: 873931371e7990143a4cf38db8d553767d2f119e02149391b3dd91bcae4651fd

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