Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a801ea1310d96c0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-30 19:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab6b2c6efdb04e61972f1649881663d3 SHA-1: d625c3aa24f769a785365e1287c304843af59a7c SHA-256: 8a801ea1310d96c02ec82d7d58c59c340019df1484c473a643512ce2d77c38fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to lure victims to malicious websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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=re+zero+memory+snow+streaming PDF link annotation
    • http://tokyosushilohaus.com/uploads/files/fipizutatulosoruwopol.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/58733988e46ecf569dafa5d55093705d/55313195042.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/37195952167.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109290233006717.pdfIn PDF document text
    • http://bubb.cn/up_file/file/8356783559.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/tageviboteli.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/7195922698.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/belenafapepuperotepuzoxe.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/89966980889.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff6b93f7b---rakuxigozobadamuba.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffda2db3e9---bomizutupetami.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/xowetelinalebibanekasifo.pdfIn PDF document text
    • http://feg.vn/uploads/files/rotawiso.pdfIn PDF document text
    • http://setunari.com/uploads/news/2021/09/29/file/6040918434.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/wobipavidezuturasuzo.pdfIn PDF document text
    • http://starma.pl/files/file/vituteriminut.pdfIn PDF document text
    • https://tuyendung.vinaonegroup.net/upload/files/gaxikadinesut.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/51004702851.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146e35fbfa9e---46473480902.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/23098945946.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/deduredosiviwezubozovus.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210916033041.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/13468825338.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/72001044184.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/32937218224.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905203024632580e4knkb595woz.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_off0000c40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40E 20220 bytes
SHA-256: 59785d7c786d9e498491b7c4255cb653e1ee1257de61de95d109fc6846b2b52d
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 10712 bytes
SHA-256: 4436eddd831424d0e4e6889327007a970eb70e37ccc1e8acf3cdd09242ce78a6
font_02_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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