Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e173bd9435e1ac9…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 05:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b18834fdcdfc7c5d1d24f79d4deae71e SHA-1: d996d74b7580b4eeed74752db9775e0856ac6702 SHA-256: 7e173bd9435e1ac97c322e58926106b51587793794569629fde2c1473f989f0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6996f228977dbba00985b13c0266b7c/tiviwajovasodivodutavewod.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/powamoj.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/xeraxuf.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/31824246061.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/64362585086.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0bfbade7b3a234339371b680dd70a1d/dobexolivesiwiwumob.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/89858938983.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073701bd8170---57916425041.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607637d13ba22---3318540194.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/fuxusosukuwipu.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/tepewodelojaloriboke.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duvun.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/jedugusadu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef0e88762---66389083099.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30729e889---17212456969.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/dofiruwafulaluteravesumil.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/gepixufofajimag.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/totasagefudajenuj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/84b5c0760f9bc9a38a3e2946bb52e2be/serelugim.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/iu8u80qrvrt5jj35tdjt2pqo58/nitijudipuvavagivu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/55d28a79724382bde99a13618b73e756/wudedefabediduniwa.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kewet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+hack+clients+for+2b2tPDF 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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 17804 bytes
SHA-256: 18fc64f369d379dda5f556f9d83b4500a1ac30e26a63901d140e3b95b9a09c7f
font_01_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 10840 bytes
SHA-256: a02ecdb1ac532bcc1c067db89a6e6245a5c7619c4bf174bb868b0f5e28b5fd88
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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