Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad999f20d40f58ef…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 21:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76d07d030606ec7337dc8155339b933c SHA-1: 085f3008767ed8c16fe3650b1735e1c11608f2e7 SHA-256: ad999f20d40f58ef270d80ccb2ac37075147931110ce7a390ee25b2522661a84
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress upload storage. The embedded URLs suggest a tactic of disguising malicious links within seemingly legitimate content, likely to facilitate phishing or malware downloads.

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://sity-luxe.ru/userfiles/file/33244793323.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jogenowuxisibusil.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/18997582340.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/894b971437a789e5023b5d27024b929b/70149757986.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0e541f70e3d20c4102e9ee003adb3d26/rokorinovojaduvapofumajod.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/58448679495.pdfIn PDF document text
    • http://vodnik48.ru/content/file/97552043100.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88ddecaf---92961479956.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zezesepewoxejezo.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wedatikuzefusalabaj.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/47541335433.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78610b3816---wotasepudu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d2a39551336416e85384bb276f132343/zudumijovijegoxuwonegobuk.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/15840604592.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8fa338be15074c604d885ec0f976c075/nupukejejuxo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b632e03c---pixurozijufuvuv.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wuduravuxajamukok.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/16993591114.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eb386ad70d210d5bc30261261f1a4b3a/pajum.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/duregerizurawetoperize.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1045c55e---81009968410.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e340fabb---76869444760.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a021b62bfd---puzijuvabidejod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=age+of+industrialisation+class+10+notes+pdf+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_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 11136 bytes
SHA-256: 2091a114b20ccc5639d1e33f78f06103a439ea1cbac43eb5d04e8ff5c0dea3cf
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 17388 bytes
SHA-256: aaad016900d9adad37d0fd5adeaebd03a1d2656a8d189374c9c975e760535fd3

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