Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f2439eaa72ce91…

MALICIOUS

PDF

105.5 KB Created: 2021-08-01 05:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4661581dc6c52c0542a9919fb33c3849 SHA-1: dfa719a80fe5ccb2fb9d5d93b886d9af7684cfd1 SHA-256: 41f2439eaa72ce91ce9a88dddc70efbb35e9744c8ae6d3c430d91efbf025a841
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The presence of multiple external URIs, some pointing to compromised CMS uploads and link farms, further suggests a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

Heuristics 7

  • 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.
  • 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 http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/molifosimanogagoxo.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f8dtbu27jnhp46poph2tbehcts/danonewos.pdf
    • http://umrllc.com/userfiles/files/82300188723.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b163f750397---29865011907.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/sezerinelazobanoduwe.pdf
    • https://btcauction.vn/hinhanh/file/67081787714.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/75593249817.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/47fcbf28a70973b325e77a5f0b0a628d/dizatagesekaduvo.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8dff5485e837f311d398c4d9a169b35d/pedobovabokesekasa.pdf
    • http://elma-itc.ru/!upload/files/99705386317.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/96175474444.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7941389ed1d0db1c73a0a6f6627067a9/jotesig.pdf
    • http://bronia.org/userfiles/file/wugutalinepovako.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e30735f0ce321e4323e9deecd97d8056/rakagabejatudukoji.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083675a8facf---48828220241.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8748ed6b3a---37661527130.pdf
    • https://vinaconexmec.vn/uploads/news_file/8142182558.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/13077739473.pdf
    • http://trimblehighalumni.com/clients/84492/File/ganusizolurebumumo.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734305e6335---fevolovok.pdf
    • http://ieltsadd.ir/cache/fck_files/file/tuxesurut.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ddd4d3ac461d3c5a3b2b9494db94b1b9/74368991268.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f704af13---67802091176.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833fba153b7---93431703480.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6dc5a2ac---nibelekojuni.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qi05ni5op0ktbr9epjgodm9s3u/sirurukope.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+are+diamond+grinding+wheels+made
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001118e.bin
c2874cfa2ae262ab3b756fae3777a2c0c7416110d3d2085a18311c0ae9bf16b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10676 bytes
font_01_sfnt_off0001298f.bin
2fdf14872aa2525fb2f76e0839c84d32c5737ca930a21ad97a53c07356ba7a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 17780 bytes
font_02_sfnt_off0001426a.bin
0ab6eced0a8fac815b7fb744e25b81f41558469ea10e0ac1db8a3b7e79d9bf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1426A 3000 bytes
font_03_sfnt_off00014f09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F09 16792 bytes
font_04_sfnt_off0001671b.bin
2e160162ec0f6862b9479a87d791d70fdddf3d0f8aee4c8affd39b3413d7ee4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1671B 17576 bytes

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