Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b78af49b352f0f1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 07:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9510947bdc0ad3f3a6b9900906730944 SHA-1: 1655666c5281bfd1a6b30af660f5e25d68c265b0 SHA-256: 8b78af49b352f0f1b2573e97a1bcee2120013b6e43e008e4ae2269b415602781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bandotrading.com/uploads/file/sorejiko.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a133fa407b---mukelokosalabufuvamife.pdfIn PDF document text
    • http://foodchemsino.com/d/files/10709286474.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/monilotubokosowamem.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/sofulovaxokiju.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/ruronobuniraxuviz.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/woxikikuvadojemogedatuzaz.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3f53cb187a71b5919ce0400231427a83/kiwezo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9521c6f07---38345334678.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/liromasikiniwabe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2811d77e6fe3746028525e4f6cf70618/dodomowowifilej.pdfIn PDF document text
    • https://zzhqhi.com/d/files/1213972385.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943bec6547---58708394690.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160800fe34d9f2---20430955322.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e2440e41bb3445af768bd55b4debfafe/sakelikebejarosewesagifu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cb76b986c54---82939667813.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607692d4395a0---56976050777.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/bunibemonabodox.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098848082701---nidajidire.pdfIn PDF document text
    • http://erex.hu/upload/file/81615488196.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dudumopuriderikum.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/bewarivifubepajoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+you+import+a+pdf+to+powerpointPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 10776 bytes
SHA-256: 4685960c7f6f8aff8c99f9dffeed5fd0bd9dc877c35dd4e2ac0f9606f6f9155c
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 18272 bytes
SHA-256: 0081f00e06cc5062c02695a977af43b5663074187f983fffbe86ca2cfc7d4260
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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