Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c89d1c8b568f43e…

MALICIOUS

PDF

87.3 KB Created: 2021-10-07 14:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bece9a748d4ce9a981b7f086bba552a0 SHA-1: 4d84697585ce38b7e6d2f6a3911c1a3d56c84404 SHA-256: 3c89d1c8b568f43e9672d4ba6c10647208fb38678d3d837b6d5359efb09f3892
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown PDF files hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rapn.ru/ckfinder/userfiles/files/kaxepawejutaximikosup.pdf In PDF document text
    • http://kayapaliinsaat.net/file/26595987287.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/pajexolutotemafe.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/jedevawidarugakiba.pdfIn PDF document text
    • http://malifer.hu/upload/file/38960689948.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/10142264964.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/rubugowarulo.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/pijanurorewarogexidimobed.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cef38484---xiwoditilakuwiribapimug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614effdbf012a---tifexela.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/42674696601.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/93801535698.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gitetevefadovelazav.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jajizugijanopopepalewagaf.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/23689046988.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/juxeripifigevoxa.pdfIn PDF document text
    • http://0048.pl/48files/file/66639329699.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615632064375b---luxatudev.pdfIn PDF document text
    • http://bankerz.in/qpic/files/46612276031.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/vawofadajatanuziduxogesu.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/4866401312.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/tejan.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/xumujalubadasufovu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/29593222549.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pigigewipuf.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/putezudisejumifiloxopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+happens+when+water+changes+from+a+liquid+to+a+gasPDF 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 19748 bytes
SHA-256: 6ff1ad7d212eea1a781b1ff0e364758ff0a8add2d19b8454a9ad852f428aec19
font_01_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11392 bytes
SHA-256: 873f3f2d252e33d4f7f2baaecf260e3d435748e7cea0d7368e8c277d29c211db
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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