Malicious PDF — malware analysis report

Static analysis result for SHA-256 d252bac8bcfcd4d8…

MALICIOUS

PDF

82.3 KB Created: 2021-08-13 17:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 851b3d384d388adf69ee14974100ef0f SHA-1: 5ec3cd6159886357c1a6a7623618bd98e28c28c2 SHA-256: d252bac8bcfcd4d8bd4d441d2363c82035fa1a4ab740955afd4d58811a64b5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fugaxurido.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1norevg4q28g0vvvvi19uj7bfs/givezifixutoxelibigopo.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/5969794385.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1t1lou0b6pab317kaelf9l2n0/jezovufibukoxemiwakuvep.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a3878baf---47571694718.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/19992616740.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/10572766587.pdfIn PDF document text
    • https://vientangluc.com/upload/files/gamugedogisujufexuf.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5eb0ea57e---68698758791.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/12302831885.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/99574634946.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/sutijutujuwimubep.pdfIn PDF document text
    • https://tekartltd.com/upload/files/ginoxogiketazunotonu.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/bowexoxusepokoju.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/97db01aeaab2127b1f2ed6e6a3745cc6/surumazuv.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062015530870554.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607e429f120c2---tabatapuzurexi.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/41791430056.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/81392492708.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/27048428677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kingdom+rush+frontiers+mod+apk+free+downloadPDF link annotation
    • 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16560 bytes
SHA-256: d5a2c2c6670249b6737ba1ce1ce7f6f1f7ed03cf9cd4f77920a1a9ea8a1a891d
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 11212 bytes
SHA-256: 21c2ca72b5f8945fcbc698d6c488489558d07930a91f8b643bb509cc76d09387