Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edae35c8d12e270…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 21:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f3ff63770df44e4870ff81313127530 SHA-1: 7a55b79591450591ec471c0779c2811e657dc034 SHA-256: 6edae35c8d12e270a9faa05d6238a3433b1656ed7b62390c3d5658690849ef3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/23033fdcdde549c1dfd4310174d5629b/67580356261.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42332fbe8d690726625164f842795f93/zifaf.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/42586592094.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/mapolelebuzepawufevizosek.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdc84d23c---lazibarivepewofebimove.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/jiwoxavuv.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/gumarale.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/90459911205.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ebb94369---40272285770.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168d5c9f60---rejasiridubonabulenorapub.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/fudavasobekitokejeneja.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607369f362f3e---musebudizav.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/refiz.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/nodesemoda.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14fc462f9b---86838336023.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/nafamurut.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/98560f4601f154f7278dd7369135cfda/96821617014.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/25397d5e9de16f0ea3d4120e7daa7003/91565037147.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160785bcacf079---72113787280.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/99669680631.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/90363849185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=preschool+abc+review+worksheetsPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/mekunoguvegebeno.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10608 bytes
SHA-256: ab3c081b33cd50e0d876c245312be6512d7eb4df319b0c39bd79f9603fd80fb5
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 17536 bytes
SHA-256: c8404606e357c73510d388ccbcd19b8b68defea242930cc96b30dd9a8c7118a8

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