Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19fd71e930ec061…

MALICIOUS

PDF

75.4 KB Created: 2021-08-31 05:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48fce7b4a3d1a4f4059558f37027ab51 SHA-1: 6f24c628c87f0c7d0a64ff7199924ed21bb88be0 SHA-256: e19fd71e930ec0614fc5f6a97d56691586c263f73bcd9112fa6f1f2065b82fd4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=java+json+to+array PDF link annotation
    • http://ducthoaudio.com/upload/files/43717807980.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a8503d86---39824920850.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/xidajaxufigeda.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nanolexezofejages.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd349133c---80755619781.pdfIn PDF document text
    • http://zuche0551.com/upload/file/44521436549.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6a7ce66245afc7ecfde1f96264d00a71/raravez.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/rofinijiziwomituwetofuv.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/18576966e3a72a19507a880b4a7cb01e/15375133655.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/e12bhvmg1js2shlbb25tbpi4ss/jexekibetovomifitinafu.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/wosebidozinubazavoxe.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/javafuj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1a99c019---niduk.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b586548165---42788278731.pdfIn PDF document text
    • https://kawanmto.com/contents//files/ziluwemevomo.pdfIn PDF document text
    • https://elektrona.cz/files/file/74533433622.pdfIn PDF document text
    • http://esipro.be/userfiles/file/lulukanavariroberobatuz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9cb40f95---kogufumobanisadafije.pdfIn PDF document text
    • http://torgoborud.org/images/file/sagedukojavokomopi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7656e7708---35542296627.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/97488496700.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nukojunolufibamelijuza.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/rafotosopusu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9579b73bacda53e30734b9a6e7b6ed27/zoribogenedosavizetin.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_off0000c46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 16780 bytes
SHA-256: c135a92f55ab86c33647f8c259f75c20872567fcab2a91e49fdca090558bf97a
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10132 bytes
SHA-256: cc798b986579d278c8361a5d16cef3a31094da7a09d6f42de3c085ba0060603f
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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