Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f34a9edc701e96f…

MALICIOUS

PDF

104.1 KB Created: 2021-06-28 05:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2109c33cc56b60a0125910c8d1846691 SHA-1: c9659100ba8adbaaa320bf0ded5d4bbf950a4f61 SHA-256: 0f34a9edc701e96fa648282d6b943322c5de8e000408e66b81d0145c3f7745b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ac2c7d444---fason.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/sofomosekesilowanolu.pdf
    • http://timavoshipsupply.it/userfiles/file/senevi.pdf
    • https://bhsbeacon.com/FCKeditor/file/bujuxodubiludajerawaluni.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/58208019184.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hos9rqjmnig2ar1bc5op46eel7/78216778517.pdf
    • https://chmelo.hu/sites/default/files/file/6900265057.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/40133237528.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f6e93884---virikaxop.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608497f65a8bf---wusabutebi.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f9fd3daa56238e45a573dfbe1687980f/velofoxor.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaadcbe76e---15854347315.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ebiv6e2n6c144k7n02eg8vhq7/fexevatobedukos.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03470c65de---ravisebupigunazi.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9b684e5f0381c061e0bf7f185354fe99/ruxovonavuguzuk.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/93792804610.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5376d0df8---82279053093.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15eb6cbb2---67876175864.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792b2386ed1---bejef.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072beaec7903---ravegimila.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0uspm0bookec7ronu0m09a65ne/sewefakomigejeluzexolu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e40d1fc067acf06a711397216a41281a/56006839105.pdf
    • http://epoxidice.ro/mm/file/84725968600.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/vtv776cc78ro36qc5d7b946sc0/fulojigawuponibadol.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jefaxu.pdf
    • http://bajcsidavidfoto.com/_user/file/xekobogudamewujaromeba.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq3ova96eikm90fejaakhefv1q/miwovazaxawevaruwuwibi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hopes+and+fears+worksheet
    • 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_off0001325c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16792 bytes
font_01_sfnt_off00014a73.bin
9dea0d808d2d6271db1a7a58f7496948afa795d816678024d1443e3565b0c5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A73 10628 bytes
font_02_sfnt_off000162bf.bin
024331e82cf13dfa65a9099f9de4592715fc58ecc1a8465974ec4b9c8b2d77ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162BF 18172 bytes

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