Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68bf4d1e7c705ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 13:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2c19674cb86a480ed3b25af793b182e2 SHA-1: 8012c85dcf979857a1ea4aba37cacb9ef2134b8b SHA-256: c68bf4d1e7c705cea6f45402df269856011f2692503eeb0482cb72a65c16a8b1
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or are part of a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to host or link to malicious content, possibly for SEO poisoning or to distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/22923337934.pdf In PDF document text
    • http://bayanairag.com/uploads/userfiles/files/defijevalogaduzetakoxe.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/68297374429.pdfIn PDF document text
    • http://htwy.com/upload/file/sibinonobofitaloruvuzur.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c53c110e316447cb7c7086cb082f5646/53713319773.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070815100373499.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jrcj46sq6s9c3k17ce8qb17262/91543396494.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/dixiw.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/23376122428.pdfIn PDF document text
    • http://flomojapan.com/upload/files/40382259172.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/pexuw.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lebusufabonijevulinumuvob.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/lezos.pdfIn PDF document text
    • https://highrise.pl/file/sazupu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb686bb0e63---56725633685.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/nibafafisipetiva.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/93895189456.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/zobidalakojanusopibavud.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xedumodododit.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e88669b81---73467096641.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/73759907064.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/680b9c0eb428f1d65e2c184e15ffd07c/89085385082.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a3fc29c7206eaebc779a691221bea13/kotegutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=honeywell+chronotherm+iv+plus+installation+manualPDF 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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 18200 bytes
SHA-256: 2fbb5bbc0d48edcd8efe31e6bbfa13db3831f3d465072fab506ae7ea6680c82f
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 10996 bytes
SHA-256: 327172b17f51c37798ecbe184c08a3bce7c7a61fd6e10bbe9e9269a82ea384ea

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