Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c712c8a0813515…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 06:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50b645a8ee444c5ce0c3172d311d1ec7 SHA-1: fed942ab39538b5c33ca5a7affd71db62fa194d5 SHA-256: c4c712c8a0813515bb5da6c9e5ec86325fdb96aff5fec45e0b735c7b655bea9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to direct users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://clinicamanila.com/ckfinder/userfiles/files/zosemuf.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135106a74b15---51781063051.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613add1b81c1c---80264180785.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/89772286388.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/45880808664.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2d251ab---lorefuxotamutivini.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066cd7c32---20914678065.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/71764036064.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/68584907344.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/88791609589.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e709bd3629---66685308574.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vubuvidogufap.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/15199361845.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/62990817501.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/15264323570.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/rogigafemojevokaxin.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/jepejifoxubopadujibovix.pdfIn PDF document text
    • http://staropolski.net/Upload/file/pukozasalud.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/widiwabobadukotojuje.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/konumunofilifutodobudadi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2aec738c---toripivejojibol.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/39446095169.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gitoge.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136822759930---26714592371.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/vuvoj.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kolikezimagonabevuvilis.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/85146129311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pac+man+download+androidPDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 18520 bytes
SHA-256: 071fe8cae1532446d270803b0f2aec35d97f6af276b693b47f7dc8e8eeefddac
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 10220 bytes
SHA-256: 51cdd819769e88babed853aa1c3c6d9f7ce17bfbef5bea8acfd1de0e13d4c521
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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