Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f4ab7d73532d88…

MALICIOUS

PDF

103.6 KB Created: 2021-08-09 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d3d068972fcc98056403757fd775ced SHA-1: a92898c8fd369e2c7a0dfd6be780d5799f27e4a3 SHA-256: 03f4ab7d73532d880e003c84df3c8854f16fedf10c20c2a8b4a438e3da81b2a0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=how+many+books+are+there+in+the+trials+of+apollo+series PDF link annotation
    • https://nestaerospace.com/uploads/file/xizewujinexakuk.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edf79c3c24a---63326996330.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wekokezet.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o7gvet7t05p4uigaif1j2ogcjm/31728960883.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/15097178234.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988e2f7fab8---givulotuwiropofigenexolog.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5b965de070d24a0af1f348e6402488a9/85479773253.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1004ttf8sgiv6tu29i4nl83cdn/zadinotimemafolonetetin.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bfc651ed9e03772e237af63304e367bc/5769120117.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/nebebogenuvulozumovugem.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///76824020106.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/k1bqo3n09oj2phl27kadfndap2/84142423394.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4349396bf---76775632196.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/98405903850.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jilakunuzegidezakid.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090957556ebf---52003524429.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/2678028724.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/wijebokerok.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1acabb3f6d8761ee9a05231f7d7a8a7/27777359025.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/50038109183.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7d9075620611c15e48245b17ed5c5b20/77539392315.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99406918990.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bed590523d2---1088717129.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_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 17560 bytes
SHA-256: b6886e141f1e8f494504a358350cd1af5c0528a697cee2b6ec1ce4e1f050921a
font_01_sfnt_off00015d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D83 11048 bytes
SHA-256: 366db574e373dbe03717e7275635df1254ba79672f80e134c73d92d5b25b06d3
font_02_sfnt_off000176d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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