Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda34234f9a846e8…

MALICIOUS

PDF

98.8 KB Created: 2021-07-04 19:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4901df51b340ca23166fe2908f696740 SHA-1: 78712e72ab6b4d24b66699235b0baecd6fc82c5f SHA-256: dda34234f9a846e888f6a6ecc224f237d7619334e47705d8cfc78ba174668224
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing lure, likely employing embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/lnptgq1252bnb33sqgikjhdig2/vanaginaregogovitude.pdf
    • http://heureka-cz.eu/files/zupepotixivo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pmdkuimt0ek5mtk4bgp6i2je42/75536792882.pdf
    • http://ciaooo.ru/uploades/userfiles/file/sefitetigafitezosevob.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/30031015247.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/keginijiteferutopotalu.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/76178901049.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef795de588---41048136261.pdf
    • http://getem.pl/files/file/rerarujinimapesolusiwa.pdf
    • https://areicon.com/images/file/nepasaseb.pdf
    • http://kaies.cn/upfiles/file/nozoxejijifowenul.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/92ojrcmldifi1dlq25vq3vmfqt/19998970390.pdf
    • https://chief-moving.com/editor_upload/file/dorurizofofodudorimofeb.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081430cdf1a1---17205937623.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/43qfgo8acspe6osblbn16q5qjc/90234358834.pdf
    • https://gamepinleri.com/calisma2/files/uploads/tidoxa.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8ced6511---ratup.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff6e17efb5---jilakalikulanida.pdf
    • https://sunrise-photon.com/upfiles/editor/files/52789199655.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ec80ee6d---kugaxuxezobipewipa.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gr28haudog0pak7e9f1ssb1d08/18706993446.pdf
    • http://marinapogon.pl/upload/file/pananaxoridodovul.pdf
    • http://logtech.cz/foto/Image/file/nutevazuxuwilibapikofilun.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bc33104ee31418cc2947888fe19381c3/56221399159.pdf
    • http://botosani.ro/img/uploads/file/denikasagajusetodix.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3b1b52ae---81754845394.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=essentials+of+materials+science+and+engineering+solution
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043b.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16088 bytes
font_01_sfnt_off00011970.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
font_02_sfnt_off00013182.bin
dd3531c18faec9cdaf9b75c74daeb4ccd1dc959538a5830a7a978a21086a30c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 18792 bytes
font_03_sfnt_off000163bc.bin
113d040156d1097bf5d5e0a616d331f293d979b46efafba22d45267ba46528d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163BC 10904 bytes

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