Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63a1893627c4847…

MALICIOUS

PDF

116.2 KB Created: 2021-08-01 09:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ff27d201b179d0c04ed68ed81f13ed2 SHA-1: 0b9559e62247299c75fc7f46dcb5f9cba439027d SHA-256: a63a1893627c4847a59e0e6d6211e8ceb4f03a6360e21675d1025ff0c148dd0b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9343

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d33859e60---40128905720.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/64987698489.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98dd580b8---12947517586.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565f0ba2ea---xumukozikilebupurutidov.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/69723083678.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62323c5ca2.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac02de49d47e9092265b78080ab0a27f/95023414142.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e92d2ada2e5---tajazemudi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920027ef57d---xilugotuzojor.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/78351980699.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100821b927c0---83542787228.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/18c64cf6e1bd469d7d7b2fc88a1284ee/54980496422.pdfIn PDF document text
    • http://juha.be/_files/file/46733369324.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lexagosemisaruledoruponeg.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/tobikik.pdfIn PDF document text
    • http://dentherapia.hu/files/file/jibaz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/me0najlbkdte2c7dof19nc5d4a/37490015437.pdfIn PDF document text
    • http://enewind.com/pliki/file/12185477614.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062620280860.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/928ad8975bd61a19e3958338d789a338/49863744883.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/16884840585.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0f7f3995015bd249014f0ffe4f4b14ab/bojukufuritovinul.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/zibuju.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096700d4c20b---14480496328.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c520a28de---7231768627.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/19846784640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gun+emoji+copy+and+paste+iphonePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 18404 bytes
SHA-256: 447516406ef49e480cf36e2756452ca66547cf748e586b9b0759da3f17c245a3
font_01_sfnt_off00014d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3C 20688 bytes
SHA-256: fda291446ea79812afdf847788ef652d190233e45f2b3b0fef87213efed7a668
font_02_sfnt_off00018502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18502 11016 bytes
SHA-256: fc4268ea99b52eada4a973620a46b3be9e368004ce2424c58fd7d671c7b33d8f
font_03_sfnt_off00019e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B687 2132 bytes
SHA-256: b68970c32f2c01f81e0f9fbf85fc551bf321379143fd9b6946278d07d92a286b