Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1d4013c5adfaed…

MALICIOUS

PDF

87.1 KB Created: 2021-07-24 06:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c907dba52bcb8f3db585e29c7d8d86d SHA-1: 6e8edbdf35e806ba61125548f3c27c7a73b95935 SHA-256: 4e1d4013c5adfaed5e77f574b118c084fcb6ca46a77e69b6e6a01a086166be4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://iberia-ex.com/images/blog//file/tizalizudurotomimem.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/2021052908362382708.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/127322720.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ac5544d4---55882256013.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/voramalilaxiniwaz.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/33c6702656049f7162799574bdcb4497/nuxeleg.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfd1a467c---gexis.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb64b334aa8---nitejivegovitaxesemogo.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/53079083511.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626205354.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cf2565b6---daduta.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89b009fcb7---26625314434.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/59148685456.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f98b263e56a---45327012313.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/134dd34944a799d23ffbff9c3a4cf472/jemoxozoponax.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608147421d0b5---36676485308.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/datowupupuwakejekep.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/tifip.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/vuzes.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/dekitus.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83338529---47642614088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+spot+fake+air+force+1+midPDF 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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 17352 bytes
SHA-256: 560e5cb3af9c8175be797c06e9909749ca4991e8df38ce1738da87cfaff31080
font_01_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 10852 bytes
SHA-256: 3bfce08f8ff2c17e4f55e24e238d091b9e343d0f170978f31977c11850998bdd
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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