Malicious PDF — malware analysis report

Static analysis result for SHA-256 1350a004d5fc4989…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 16:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4499be9db5323b6159a3fd0a9f6e7eaa SHA-1: 2c157625746d22269293618ee2c569ba57d8c25e SHA-256: 1350a004d5fc4989b5fc4427b0273632c6b01da13b2f4a8255b5cbc0a5b887f7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used to distribute phishing content or malware. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pixomot.ru/uplcv?utm_term=absceso+perianal+antibioticoterapia+pdf PDF link annotation
    • https://marosme.ro/hirek/file/wikunubusixo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/899d2c3176991104dab9cebd39e5682f/76687664985.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20ad2f8e1---40442506278.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/54922047544.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/67445811419.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/25102068476.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108151800021990.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b838b393037---69182050168.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k9tidldlt208or00klfsh7tnb8/vilenabi.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210626235858.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/luzejejanetonolotexe.pdfIn PDF document text
    • https://vestol.bg/files/file/81864682299.pdfIn PDF document text
    • http://elsadaulte.com/ckfinder/userfiles/files/46649987984.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/kegunumavukizozipugif.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e138e6f1756cc2ac4ef745e99e00524c/mebuxewanuwajanepezedo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/accb00074910e5ed4222275cf1a9fdba/gaxozodij.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/46836470798.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a745cc1fb---gonelifikavujunosozo.pdfIn PDF document text
    • https://educhina.mn/editor/files/15727380975.pdfIn PDF document text
    • https://5uempat.com/contents/files/64893519194.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zosezupakeruv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c401e0bfe1a---sebefuzo.pdfIn PDF document text
    • http://stonebreaker.at/94925224278.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/19509623972.pdfIn PDF document text
    • 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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 17856 bytes
SHA-256: 7a53ef0e8883ba9e03cd426fc45e4551504abcaaf5f0426865292989da9eb0b8
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 10732 bytes
SHA-256: 21289272fc48655d1b414e36a8fec0d4319f32f7da1a0a8eded23c3418ae9446

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