Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39ad5ad3c4902e9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 758925785377a40b21862b2ccdcd3e9c SHA-1: 545904febd74325d6dc81507ee55434a64eff060 SHA-256: d39ad5ad3c4902e9c52088508b408e50a0cea6aec642ffe6aef52bcbe32c575f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, with some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of many unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://domusanna.it/userfiles/files/69047751661.pdf In PDF document text
    • http://hurtglass.pl/upload/file/faxifawapevefizijorukex.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/lebawukevebavekezumiled.pdfIn PDF document text
    • https://greenways.at/userfiles/file/timisu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/zuvokuba.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/50828115916.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tefafisu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/43324484342.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/35311665556.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c66a932f6---97702368250.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a362b10f33---56698014650.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vogufusopedulaxileruba.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/37639608997.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/39522405913.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de60285cd4---zanigepirejetomulobeko.pdfIn PDF document text
    • https://alohasafaris.com/files/33696003518.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631197821.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/16002560403.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/kevesamu.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fewatukipofosoxejim.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021918200375058.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/93248505277.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/ximaberakogonugewedoz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1ef0a7397---21773594974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reface+app+free+modPDF 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 17544 bytes
SHA-256: ffee55f90caef3448b9cf9a2678822b038a5107f4f4bc7be61421d75d4181d3e
font_02_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10320 bytes
SHA-256: 02da621dbdb15884b4ea77fd8012a4f69f0ec4b8f043fa450aa8c0350452c2c3

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