Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd08a53a086a82e2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 12:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98e3404d67c59447a4ff3ff25dd7a352 SHA-1: b3c47d81378cf74273efac46a2eb0637354af8ff SHA-256: cd08a53a086a82e265048b5c336d110680bc80775eda2acea2b09c3a9111fe21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oueb2fubgbgvs14decl58jfhkj/wasazavanix.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/839588f999c337a2b7bedf0603e296c3/kumenevewal.pdfIn PDF document text
    • https://foulardfotografando.it/file/nigokefipezafiba.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/38298576020.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vimulewaledagomul.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/posub.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/91031002277.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/4ikj4b1g51vs6ipgcc3t5d7biu/dufebufe.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/lebomedolowexilena.pdfIn PDF document text
    • http://innotack.com/userfiles/files/45369821343.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/39019783866.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608850000f4ea---wilawezi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/h5pun150l9ct95p9flbu9j0757/7718229110.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3344cb1fc951095348ea1f9e7cba0d24/79759696038.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/37072912083.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f08c8ee8e---68736459557.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/084718b1165aa0c003b7ac7785f0042e/79282278463.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rigovumabaw.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bafcd4---56004655538.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/uvncbhaepn9amkgc9loupcbqk5/fiverikeropib.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce85c9bac0---73170571385.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/pemasak.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b75c378345ad4629f6bf4502c4340dae/vowoxixuzijisex.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/zatawekubumixo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/54540c874ce81a9ba389df3643df39dd/19388011033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=itv+electro-pneumatic+regulator+with+ethernet%2Fip+manualPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 19928 bytes
SHA-256: af04ec55164b23e6e16a6f82b7a2aea5ec0c2fecefd710ebdd67a280b0e3d8b8
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10924 bytes
SHA-256: cc74d11c6024eec61b762d01e9ab4de3ed89dcce6753ffd0e7b143b585ea7d45
font_02_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1