Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d76eb8db443120c…

MALICIOUS

PDF

97.7 KB Created: 2021-07-01 09:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4757129c1a6234aaef1d045ba4dd6145 SHA-1: 168cf4396db547a93bff17ff23e58f6870760698 SHA-256: 8d76eb8db443120ca1705f57e6bdbf84902185eaa34889c3e98597818f52bc3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings and URL analysis confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.alapan.org/fckimages/file/72084453209.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/e5jkud1gaaggct7tucp1pi8pju/rokalemotegikomujogagoxaw.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/116935c7908f6befbf696906530272ea/kiremumonawerukizuzezofe.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jifew.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bobeginerejonemokelafonos.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/xubarolesejixubeg.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/luzojonikopataxetugogez.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac9093408---75280926572.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c5501a5602a1de9498da4c9f273a5e0c/5799119652.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d345f0e88b---4792274611.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52b0c2e8a---zasotidabirewekaxojilem.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/58336376908.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4fd16f6546416aed684ecbacc4c68772/wajomosefaje.pdfIn PDF document text
    • http://www.bash.cl/media/file/55309068299.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb2b31bc8---fawuzopixeripizixunajug.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2f9a82decaf94fefe039525a98c1d675/zikalor.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b692a6cc32---gopajif.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1eed942be---soxabukilidowizukowugudog.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d204ff8f---59951984485.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f85fcd255---49643055801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=humid+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 22104 bytes
SHA-256: b6459d25dc26cd90e365a9f1ab803d3db75402dbd9acdc22051a74d2ebca8975
font_01_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9F 10468 bytes
SHA-256: 752c2fe0656d85766676ae839c5035e14c7f6e25462d9ba717ba2eb0a9a83579
font_03_sfnt_off000152d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D3 16712 bytes
SHA-256: eab9ad65e541fe633b07454a3b19cdc43d3b202273bd899a5cbcda4f827f96d2
font_04_sfnt_off00016aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA6 3020 bytes
SHA-256: aaaedb4665d5b76579f188e46e5319c1708968a5ce6ea9d1d3957176a9dba33f

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