Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3517b4a7c85987…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ac47bd82a6283adc2c3792e5b4501ea SHA-1: 9fca0aa2b4a1cfd868c722a8d5503e94a71c6e33 SHA-256: 8d3517b4a7c85987033337a3e6f8825ddc306466382778f43ff5d5c7b6684cc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'link farm' heuristic strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://warwick-ems.org/userfiles/file/27579499658.pdf In PDF document text
    • http://spad.kr/userData/ebizro_board/file/gitoterusorimulazodozuw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f965a1455e---tupujepugap.pdfIn PDF document text
    • http://boardmark.com/files/file/mabeke.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tasusuxijo.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/fenax.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/tekekukiw.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613278920950b---dazejana.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/xukugote.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/jemonugivubunizu.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/tebuwuwam.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee3c5a776---suvugegetuwixebivatiwun.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/dugivamore.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/wiwopinogefisudewoxomik.pdfIn PDF document text
    • https://congchung7.vn/upload/file/82016597092.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16147641572ae6---90892827479.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/nemadilimatuboxab.pdfIn PDF document text
    • http://hla.vn/upload/files/lasimefovenimevirux.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jasuxasotenukovukumowo.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/dokinofujakop.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161477f97b6764---sisawefaguxirajororag.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec1537299---30405126605.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91368923870.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/pilixipev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ios+dan+androide+rehber+aktarmaPDF 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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 18588 bytes
SHA-256: dbefafed2f14e5c36ff992c2e93e1e983d764001d7bc9b7d049211242139b467
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 10652 bytes
SHA-256: 83a84c2a0dd4fb73d223bfabfa63bdcad9fe022bd753a8b897405391449d0050

Open this report in the interactive analyzer, or submit your own file for analysis.