Malicious PDF — malware analysis report

Static analysis result for SHA-256 6808c89ac30ab56c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 20:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1347949d17ff93018a40acbcf98924f4 SHA-1: b4d6dd61bb63f32a5370dae8870d4871e80e7129 SHA-256: 6808c89ac30ab56c3fb744b1459a6ec54c3706a0eba4b79880aa992e38237500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://doudou.tw/userfiles/files/67364314688.pdf In PDF document text
    • http://amadpich.com/userfiles/file/5910060810.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6cac5c8fe607b37c74df823da01287ae/54655019464.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95062a802004ffa7c56c98d653b91c51/1625631053.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd8ae6731d---92974235360.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/38097450843.pdfIn PDF document text
    • http://podushka.by/files/files/pivuzezoxevilaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb8727c80---firigiviporurevoz.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/juwogasigam.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2735b8f797721bb07e5daf0c24a13aa8/65776245399.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077200b168d9---nowemotexebalonuj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/30a38c3842d75637a6f16ee9565c8e27/12458582318.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87813252637ed6076d691f2ee63639ae/levedagokuverixetomisi.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/81316191535.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jgt48up9bkjog6t6gfudbrgreb/26424852704.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/fkrc23tufm588gg4d305r7fnjn/gikolopexunox.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d22348097---96250450754.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6e62cd4a292c830dcab2a5e8e6518787/13552629333.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf986d731---kakuwuzus.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e20c51267---todow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=braun+temporal+thermometer+manualPDF 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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 10412 bytes
SHA-256: 8141dda72b4df05a3845fea60ad1877db6bc858867089d3991e309dfd12295ab
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 18496 bytes
SHA-256: e9d6f4b77ca0633ef41cdcfe3423e6f40ffff54d5d22d6d9410422953da474bb
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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