Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98509dfa80c0aa2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 03:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f52b5c446fb30e8c95f785b84372cac0 SHA-1: 8b0ee9e7f56c044df83621d765a4a84f4074400a SHA-256: d98509dfa80c0aa2b128a83f4ed7e6a5a709c9808fbcb200001a8410d14873b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate the PDF is likely used as a lure to compromise users, possibly through phishing or by directing them to exploit-serving sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://apz-arte.com/ckfinder/userfiles/files/242613533.pdf In PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/93633495022.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210902010934.pdfIn PDF document text
    • https://anjingliar.com/contents/files/jatudinasewotovixesa.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/rivojokarizolesi.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gunolabawijepi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pavikex.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/49679227044.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71922041049.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-19/20210919200846609942.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c807eb4e6---fazelenazerajusave.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/5975896129.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614052a0c6f36---netof.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/bupaxef.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50983563665.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/84148691404.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/77460145431.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/29450948218.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/53556717468.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gexemiwanuziri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409af80c574---66255246105.pdfIn PDF document text
    • https://loctra.net/userfiles/file/55769931926.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/pukijoturovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=moonlight+sonata+guitar+notes+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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 17704 bytes
SHA-256: 6bd87671637b1a999d048157b97be67d4801f6060d9b68eebaab45af139ef0aa
font_01_sfnt_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 10872 bytes
SHA-256: 22b50a3497babfbb611b9581564ec2e306a2870443fe9cadf58a75dd7d1094cf
font_02_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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