Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea150e83a562e1c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 17:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d3c23f884402856ad1005b81032a6d0 SHA-1: a278c9054aa8d6af512dd1c436feae8a9ae3056f SHA-256: aea150e83a562e1c5c99b2f458bc32261a151d47b616e7764c59658c7b15557c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, many of which are WordPress sites hosting PDF files. This suggests the document is part of a phishing campaign, likely attempting to trick users into downloading further malicious content by presenting a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=pdf+combine+free+software+download PDF link annotation
    • http://trovas.com/userimages/mekidawexako.pdfIn PDF document text
    • https://cubic.is/userfiles/file/104983116.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/tipakujefadupebodojisuza.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/26038289715.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2ce7301a---96455273270.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/vazopibejudirodorogidopow.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dae2a1971---76203428449.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/42644639528.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/83881643778.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ed69a3ee0c603a383b32728534a2a53/ximokox.pdfIn PDF document text
    • http://sushibelovo.ru/files/37067459780.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2ba8b6d0---tojevasoserotik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cebd12eae1---pijupagekinasesumafujijax.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/dagexo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zimifofeki.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce2e745e---gevugizujubal.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/25934113437.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nepepiterisotijasu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c5fbbd76---59398778286.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086106c483b7---doxupeveniker.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/59461116950.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10864 bytes
SHA-256: f31be697e3a0d8a1bed6e5344d5af04d4ff12fb578e7b91ba7a91d4404d0de10
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16980 bytes
SHA-256: aba0a9ac0afe9d13771c20f62d5e08e7b0baf9a2ca0377d17c06d053a0195285

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