Malicious PDF — malware analysis report

Static analysis result for SHA-256 edea4fe5fe65b9fd…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c6b0a5b5d12d564b2bf598b0ec0dc18 SHA-1: 6783cfbbbed85d11f3fe6093e1ffa51c4005c2d9 SHA-256: edea4fe5fe65b9fdfb77fd44e5068b0c8b1b011264b7d80c2eb24229915254c9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://atlaskvartir.ua/data/uploads/files/33558499740.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/16309985191893085519.pdfIn PDF document text
    • https://stvorki.ru/files/file/jivupurepaxoxedolevujiram.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hmtjmdg1teqp24cfqqa83469k3/fuzikubulenurazi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eec8cb867de8e841ca4a2ded0c5ed689/26107758732.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fikoj.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/mugenadapepobu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ic7oa9pgu57f939663smaeevn4/mivonuzef.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/mumipubabenogobixini.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tozow.pdfIn PDF document text
    • http://primaneighbors.com/userimages/fodonugagafeluseno.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7143e825---fetepegizaxekaduwemomutum.pdfIn PDF document text
    • http://keitbg.com/images/files/bukulumodavoxebe.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/timosilu.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/tilivajobuvuzejuma.pdfIn PDF document text
    • http://synhbio.com/upload/files/sesesaluzevuf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5da13ab62---72770126416.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/xetiwavomawimoriwib.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911000508_3c66oo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/72134783513.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/84255958046.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/29f3aca35ddd5cb2ef5ff357f050dbcc/ruginebebexepijawebuwedo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917052746052.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/49175608253.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/pibegatimibuzitumoxirifan.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/70285336391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=convert+mp4+to+sound+filePDF 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_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 16836 bytes
SHA-256: 550babb1f9c4ec1fdbdf1c889844fea05d3ae03abf5d65d3e3c1d02c70706e38
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10772 bytes
SHA-256: afd98413efd5ef56706dfe748f17d4f8e631ad35fde2b6bdd586550e839893e6
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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