Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca31eb224f6c310e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f18450c28637a50665cded9f0e66bcf8 SHA-1: 24ac9f10ad13f741dadad976bf729eb944dcbe5f SHA-256: ca31eb224f6c310e67d1d14afbd19c014967ddb137a8229847168ec2e6df9a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms pointing to external sites, many hosted on compromised WordPress installations. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to potentially malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://chcial.ru/uplcv?utm_term=access+android+apps+from+pc PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/aiqbaoc8ai0p9ra0gactgs3mcg/32095040545.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80781827706.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/2569115403.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/podosakenapajagititip.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/gigawevamekuvaw.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b456734aa---saxonu.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/98436800872.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/paxomeg.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/18315621722.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/risejutimumez.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/62788137105.pdfIn PDF document text
    • http://irollee.com/userfiles/file/89916520196.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/tanojexusu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/juxoza.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kelogudipedetufutapu.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/zukidupagugadijitora.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c923355e81---pipuwifilabijonakijulod.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342b11a045f---josurazifa.pdfIn PDF document text
    • http://gosapahostel.com/userfiles/file/94297245800.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/43630099008.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kirevo.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210926051229_7x6vt3.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/84403577830.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/reragepinizigupovonomefu.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/xegowafebebupumasuv.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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 10616 bytes
SHA-256: f9a096edc58651945b3ab91a2b260e9484673c7acf3192c8ee2ece2962cf00ea
font_01_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 15884 bytes
SHA-256: d2f1088aafee3250e6192aa16569b8606a8e9ff3856bc61d687f2d5f4c003cef

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