Malicious PDF — malware analysis report

Static analysis result for SHA-256 023251f07bce4640…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 13:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d94ab538aef7430f9b034c922fed195 SHA-1: 3a21694063787dbd53654581566e730435873195 SHA-256: 023251f07bce464020553086f27db8ddad73cc5133e55445284335a95b7c1744
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to numerous compromised WordPress sites and disposable domains, suggesting an attempt to manipulate search engine results or distribute further payloads. The presence of many external URIs and the nature of the hosting indicate a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc257d7dc78---68169668021.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085449cc1dc4---28948802095.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i8f197rvcdildnulnc0d06d2i2/53722075407.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6efe6c0b---lolorudimurupujiwe.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bd74d25e---44165988502.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8dcb8fb62442fa0920488897df5c3c0f/50178885242.pdf
    • http://luxe-pools.fr/i/File/fuxinediwid.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ce442f8f---xeparov.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfd5d5fe---30478784063.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s7qj01ipds73ct9a9g1db1v8n7/99154215695.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/17252814129.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2e7edea9d19dad07fcd01bf11e8a3c27/nexuzewaxepolodukolelog.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1ba0ff9e---26810156288.pdf
    • http://kelvista.lt/images/files/93036911900.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/o4a2177sme2mb2a375fh0neu6t/wadonipavudadomimojaniz.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/11931369759.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f539ea01---bobujaxibalumuxa.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd42a98951---puzekupukasogukubaze.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c688c80475---lomafipejipivexutomejixuw.pdf
    • http://classicalgardenornaments.com/uplds/file/vosis.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n7r7mms3mibubv2rirv8f9m083/7011079110.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/mimumudokapanoxepob.pdf
    • https://meesens.be/KrMee/Tekstverwerker/jekasanododisu.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7e9111f0---17379198523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=volleyball+referee+whistle+signals
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin
1d8b8cafc544bf9fbf5a5b3f4a6d2aa97fd7197f2e234f9943ac100e7e7889a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10804 bytes
font_01_sfnt_off00010350.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16792 bytes
font_02_sfnt_off00011b62.bin
8a3a5a2558542d3dab84fb8bc0913bce04f27d37aa821f70a2aec95c5a6178f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 17224 bytes

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