Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42d93cff5b3827b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-08 09:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263cc349c95c063b638d60b9db7803fc SHA-1: bd42e9fcd465fd63f9f347c37ce7f7bc7895e3e8 SHA-256: b42d93cff5b3827b9d2af020bb33a692a893a7d3fee7550f1828c8f6629b80ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it functions as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.asslar.de/downloads/20232975663.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/998d5eae9d2b2fb755649c20308ffebb/nigem.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/taxowatuzapabixapi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nutetanaxesuvidu.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/81912832423.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914f2de937f08e281fdad1299629afc5/jadajudebirajew.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ec00e9de---61080373097.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/22491279473.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/katotufugiwoko.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc490d2f7fd---gagade.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eda66815c2---6118889093.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4f6bdcvvjo9m4qa1jtndh41c2/megakog.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611957aa692ae---bidesovarabigilaluveroz.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43446c89e9---relozu.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210807_33C3D084CF62D32B.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2cd32684f4b516a50b176501e8537f57/91830538118.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/murowu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/5497935875.pdfIn PDF document text
    • https://kham.vn/userfiles/file/puwonel.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691a33de2b---22183696684.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11698140328.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/60125066775.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/27382552671.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/85952616809.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/19701290987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=intransitive+verb+list+english+pdfPDF 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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 14996 bytes
SHA-256: 51ac29acaf97159d407212dfb2b123940959b0b34d78bbdb888f4cb97581a1cc
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10816 bytes
SHA-256: 01eaeb52e90757a27f81a8b0ae1e526c290da447a0429c588e5e2a31469ebfa5
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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