Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0d3a16818af4d2…

MALICIOUS

PDF

91.4 KB Created: 2021-08-11 02:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a279418fb54a4bb4ec1a63d9987c27d7 SHA-1: b819f8934d91b4b9b0ce2c677e45fc6e8ece9612 SHA-256: 1d0d3a16818af4d2f0dcfc6bff7148080c3775ebdcfa67a4da8373d0f8d2f92a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df85bf962---wuvojenuzovajusajejonenex.pdf In PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/vezuvut.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zarakewifebilisures.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d012d8d89---kujidorumofeda.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/221ef55af1888484f5f3239e2e733e78/firab.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fepomaxulivedakifinetusuz.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c547f461af53bfb1c4dea8e133d3e69/newunad.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/busazowujuwowufuzuxir.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/32445055810.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/62584172382.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce40c203dc---bozorepipuzepazarige.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01d8872b5---jemiputevifavuli.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc40f505---59642580632.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cbb498e6---vomamawovegew.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/1178806334.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/29302862678.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/wulopamutakepitaxupuzu.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/71095794413.pdfIn PDF document text
    • http://toonesk.com/upload/faxep.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b752c9a6b---zugavozidusopaw.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/dabojabarunonunaxonuzezi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed92b513f---94777882080.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jufukaxufebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gba+emulator+android+apk+2020PDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/23790195858.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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10996 bytes
SHA-256: 76f068baaa97ea50c614ea976a5f21fb65227848d47776907cc518631b076af1
font_01_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 18048 bytes
SHA-256: 3fc25fd23fc37bd1a8c88f0863c0671fa995b10487d9f39cc17b7fbde8e25d82