Malicious PDF — malware analysis report

Static analysis result for SHA-256 9391b54132a7ad79…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 21:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58b7d54fcdf77ef44da711aedfead796 SHA-1: 4c6f368b58bf411dc999cbbee63c1caeff24c668 SHA-256: 9391b54132a7ad7949c9a15663fbb1858e5ece04481ec3bbe4b203235905519b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5f1tmgmme91jigt6riupau3cc0/78571971392.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cb2ca008---sazenitokikefaxurimutuwan.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72333dab1eeeec9ad0a587093ff4c8a9/fadoginemab.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5900170019cd6d149b6e848ec3492d47/30069771368.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dpnmkoan10r75kv6cqj65fupf3/95204548058.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210627032054_m1xik5.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/970035626aa8725576d68538a3cdd29d/58295645728.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/nadiwivarenibajawakeg.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ed6ee9d331114e0ee454317abc2461fa/rujebazapazarejakowavepa.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/tofokupogazanonadavol.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/8224182143.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/39951676983.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a059fedf9e8---59669573667.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5962567903d588b2b46075d93fa52b2a/35516533376.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/gokodifosujupiguroduj.pdfIn PDF document text
    • https://stotex.rs/files/zaxagikapupixora.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/72745227351.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/bedenitazejuvif.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8957189184.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/20224284487.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/buxafiropojonegawemami.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/disapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rethinking+columbus+the+next+500+years+pdfPDF 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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 17000 bytes
SHA-256: 25b8fe99031d73f477074a1d2a646461eb37c3e2cacd9e36b31318c253cce1bb
font_02_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 11916 bytes
SHA-256: b666bbf56d35a33f628531e3438db0ea988685d8f5fb91d925b79e05091f8aa1

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