Malicious PDF — malware analysis report

Static analysis result for SHA-256 385fc91335ed2d81…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 575f3676a3fe385c8be6016fe71ed621 SHA-1: 0133fe729da1254d28eac4cd86d5ee063a8e7178 SHA-256: 385fc91335ed2d8198acdb6b1cf33bfbf5c0792b8550de94fd73cd91e08d774c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/caf359f0c2f87c3252cabd2c10c7cd18/nuvitosokewadujopexuk.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/83748374174.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0b3b28b6597de54fc228dd7deed507fb/10969254827.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u826pj5ggss6ooaeemagqthi36/gupawagus.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7a3fa1a74---23096732656.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/wuduridogumowotitan.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jopanut.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/67737697840.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/92116719176.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072889af3f5d---5566063769.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/97414724572.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83beb975c---mitapaw.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/18360022105.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/35888183203.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/siwefisozuxowunavowigugid.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/mesenus.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/wenowidewobetububevamexu.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/razejiwubefa.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/45607356633.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/jotojowuk.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ftbjl358tnarv0u199nt1i1ls8/81832364243.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/97464546796.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/36145031470.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gr9oanuvup18vba89uqh9r9m60/77909421905.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/sapolipugakitinizivuzekeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=variables+in+javascript+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612add84cb368---zusatelorovujaki.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 17496 bytes
SHA-256: b1bd1c201f29a1f0594a83132767313117960832b14167f1381fca46be5ef7b8
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10800 bytes
SHA-256: 102621e4de48550131212ff0b2e7a230201dab9b366e5365d13fb59524575201

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