Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7642d45893f91b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 01:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83a4bbda9b7f37871c89c5bee5012f16 SHA-1: 7eb1ac6c101ac0dcb03c74f6f49c08e922ba3226 SHA-256: e7642d45893f91b188faa5e2e4432360ec12a7358093cd260fe6e282b73f68a6
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and the nature of the links indicate a potential for redirecting users to malicious sites or hosting further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://videofilm-tv.ru/content/File/35331890280.pdf In PDF document text
    • http://myexamadvisor.com/fck_uploads/files/7835563255.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210822_5E32294ECE758D81.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/gakesi.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jolademuvepebizinobija.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff1d280d2---32655348989.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108230313278953.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160844d9eb44d9---reloweluvisusoxowadapor.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075ef9e340---6919030634.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/dedodamug.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/gudan.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/24861153897.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61415495636.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/tiwuxowamozu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca97a3c730---rupokumazutu.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gukofitoditedefiteso.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///vuzur.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2ac79dab2---kewazebebirijovof.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96aa2732c---95470449552.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zopivopasasowuzomu.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/53878063867.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/06d366020a20ecebbce988920d6e3aed/vekevitavoxowepetat.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/95192150712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=simple+machines+crossword+puzzle+worksheet+answer+keyPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 11308 bytes
SHA-256: a8c7aa1adbd60d17c75653bf6e01dc0a87b216cada248a6b6a5438ac8965d174
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 18600 bytes
SHA-256: 79f54f56113078c18eeb518a95e03dace9d82fcb51870e2dda01742b3148e512
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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