Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc1cd4820d4d61c…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 01:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 487cfc920247c5c14f5d38ab894d27d7 SHA-1: 8ef49da8f123633ec65450b508e5034778b11760 SHA-256: ecc1cd4820d4d61c9724250327dbb1df2d9e592d6642f9e0f2e908f3c00a4320
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure and URL patterns suggest it's part of a campaign to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yukkumpulgroup2.com/contents/files/69504896756.pdf In PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/68528993965.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/dagukijagexamoponudet.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614966cfb963d---46808440613.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b73ecdbe0b2129ae79586d27eb6aacaa/pomenijezetomoxuvamoboz.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s28n7r6s9d95e6b6t7bl3u0lh2/23861839858.pdfIn PDF document text
    • http://mcutech.net/files/3133100047.pdfIn PDF document text
    • http://grossbuch.com/upload/file/36278819904.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/jafunebexikoletomegu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b083d666---mipakutujomumelazuzulif.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/2633379958.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/dofidesulidoziwebefanozez.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20211001064741.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f57287904---janokusexujamadim.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/novisu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f6e7b4iob1rc5q60pec0qt623k/18254830050.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161334edb4a1b2---20154870541.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vazatefisoji.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/47668504783.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/wazojeninizoxa.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/50776746506.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/58789661966.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/vozurek.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/66356583803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=toolbar+xamarin+androidPDF 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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 10216 bytes
SHA-256: 6778c86a239103ca83e601d6c956e8758cad2ae433ac52ecd5676bc3f1f3b1e0
font_02_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 15072 bytes
SHA-256: ca00de9f44e7ba78422bf73026e4398ee9fe35c5bf72f5b8033bf7eb430b8bb2

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