Malicious PDF — malware analysis report

Static analysis result for SHA-256 1990ca84f7838547…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 01:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1990c762824fdceacf2b22f17e89a4df SHA-1: 0ad6fc537e9776f69745f5fde1d21b78b52fdcc2 SHA-256: 1990ca84f7838547cb81575efb46a6a3b5b399bbe22f93c3c48aba3d156a13a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=hepatitis+and+alcohol PDF link annotation
    • http://buydecor.ru/uploads/files/nudidunafefufovifuxika.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d3a3ed031---kogikop.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/ratev.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098c30549428---42997958490.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o84i6o14fun8775ujsu7sp58fg/88778972954.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/borewerewifijar.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/xerafodu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/011b7f8dea68f777a1b99f5fdc8a4ce3/85488866831.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/zabaxilusebi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/josawupuxazifofaj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114123b82180---5516730225.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/timokesel.pdfIn PDF document text
    • https://rubfila.in/files/file/vowalebodanogoxinu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wuretivupusasagadokinare.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/37518873461.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zupatotu.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/fozemiselasisufog.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/banilakodu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd4dd84a7---94410807223.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/89971095408.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac390bc744d---13396821375.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_221853.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/tiziziwitapomori.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17508 bytes
SHA-256: 2e0bcad93b2f7ffdca80a526c578970d8c35e9fe4d6c1cb52b6756d21bfb75b6
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 10500 bytes
SHA-256: 782d5ef6e5e8ff67c564ea20727c17765ada607c8a8e912697589a0b18f05b26
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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