Malicious PDF — malware analysis report

Static analysis result for SHA-256 a627398bc5341d47…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 01:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9cb6031281b160bd1ac31d68a037ba6d SHA-1: 9c2b77761b5d86e83e3ff818b9f7f2d8fd62211d SHA-256: a627398bc5341d4700a17013e2a59e4f502b90423682b76404db3a347f4128cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple external links, including a link farm on compromised WordPress sites and a URL with a 'vpn apk cracked' term, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=vpn+apk+full+cracked PDF link annotation
    • http://rivebistro.net/ckfinder/userfiles/files/55180582249.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jibuvovugotifasojukurafax.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/57801592642.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/23658650392.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/jovebibigobisofat.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/48142257013.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57732a52b---89222464207.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/16c082c6e6de5fd04a4551cc20f4b5d1/53316484578.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/87677634732.pdfIn PDF document text
    • http://tano-cable.com/d/files/nubawopejodek.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/84680185358.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tabijoparetisadere.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e261fa46---zawitoz.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/45778695273.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/wunabukosaketozelejo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011655367502.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/81683299971.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/fotixarenazegejuj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce0f494238---51498491621.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/78295cf03c0214b2766a0a12f438965b/nenijasenomerid.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/luzexoxilep.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/81159346410.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/21ca0c1158fc10794f9b87c05c0a09d1/jagerexezebu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/rezamogov.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_off0000b914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB914 15400 bytes
SHA-256: 8ce53295a3514291752bc2948e02d0afcc91c855d6f425b035df79444d01b2b2
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10296 bytes
SHA-256: 85c0037c05c98eaa3f561e1cadf21ac6a6440dfbe2b6b30028f79316b64965eb