Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec7c403aa61c3c…

MALICIOUS

PDF

88.4 KB Created: 2021-08-19 12:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f271daa2a173e41ddab1b3e470294c79 SHA-1: 1d1921e5ddcebe01e64a4a0000421ebd0af17185 SHA-256: dcec7c403aa61c3c361d2437c999934f22ade79e4f557815e2b85ea6cdbcc5da
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL distribution suggest a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://eros-arena-reutlingen.de/eros/userfiles/file/vivajowolewikuxoraxobu.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40876665435.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e322269520---83240567130.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/xevezizelebabiviwada.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/34082aff3119d6dc4c5964a2b310cd09/lezupaxix.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/43950959200.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9125c6e127---24205404520.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/26636471408.pdfIn PDF document text
    • http://szpk.hu/_user/file/benonakuvasibilibilu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/60183ba40ec9c7db7beaa96dd5b23a09/sixuzufu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/56477272509.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2cdc134f290b1cbcb7a8632596724f25/xenelor.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b50a1e7855139785fadb1e57ee241f40/kuzidezotabiwatudisa.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210621_3A79F23726FF36DC.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/925c75121e515478c25137634855d963/43048732019.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/visepaxowamerumoligisibun.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55664461a---buvifotowavab.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/2533201804.pdfIn PDF document text
    • https://werbemittelag.chupload/file/27167915000.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/1258780884.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/43206360268.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qvk27349ecpio9k7jh05k79hj1/66654946854.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/84788667539.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6fddd7b7779f7bd0061091708e00e5d7/solimojinedogirufeje.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/lomelugaledifoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+a+good+daily+stretching+routinePDF 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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16448 bytes
SHA-256: 2b82b28497920cb709096bb450530c412e13264969f9ac3f1777d493c95c88cc
font_01_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 10856 bytes
SHA-256: d5ee603a863dbbc997ce8449a35cbd8d17fd43b5d6c03f8c40676f2917099b1b

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