Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd50e78dc784e5…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 22:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 255090841c44d7af7991aa0c7fd43d6a SHA-1: 81e6d00acbbfd2814fe88e3303d79b427af29a1e SHA-256: 69dd50e78dc784e55eb821e1a0bf5b97b44c007c5a7e4bffb671d12ff378b8ff
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad8c459ee---12352031410.pdf In PDF document text
    • https://nazragame.com/calisma2/files/uploads/85319399028.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/27511512344.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/eea249ec03740cb8917d1acd8232b807/lekujexovewe.pdfIn PDF document text
    • http://vodnik48.ru/content/file/divovimaxisukanudezosago.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/fakijoxevukigufuba.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c59278cb---36750435601.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf27e9702e---jixebisusoxegubinafubuge.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6ebedb21---60582945112.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090072dec64f---wesutejilefigotije.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/55860041364.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607762b27138e---wiguditexapugoseg.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/umm79pdsejatk2r8vlrjer6523/10047610339.pdfIn PDF document text
    • https://highrise.pl/file/15593981884.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/jujakof.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106231200033290.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nubekufo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bfc6f15099ef782d02397d00aa80875e/79375815603.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098613de9eaa---6743397152.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c248c928d---vabofofep.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/stt4htl3tebi9ctiednuvvn25m/bepimonidiru.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c772a50eab1---74400890224.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/faf9f2949e3dba7b54111272d5a1aa70/tatoxewapaviju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chinese+government+owned+companiesPDF 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_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 11096 bytes
SHA-256: a210c508ed98f3885327eb6b4fa2b12acfa7fe5856e84a3033c9ac451005d612
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 17720 bytes
SHA-256: 33ff1cd402bc937714f9ae9064412bb7cfd6d3ce67632f0ede70e11d567fb553

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