Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0ac3ccbea2941a…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b2dd5eb82292505bfdd793f13af4166 SHA-1: f2a16438f37e175a52e9063a1f26397f9063ae55 SHA-256: 8f0ac3ccbea2941a76881625b47cf2587cb00c45a6380b3fdbd8f5c5b61e2fec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URIs and link farm characteristics strongly suggests a malicious document designed for distribution.

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://crysiq.ru/uplcv?utm_term=pdf+resize+software+for+pc PDF link annotation
    • https://himalayanwanderer.com/himalayan/userfiles/files/pukopejolareba.pdfIn PDF document text
    • https://invest.pl/userfiles/file/25507284537.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/varepagib.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16154311799b8a---48412735659.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/7299304666.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/sovabunivagisov.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615438b08c5ad---pagogagajaralerani.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109240812151259.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/lawagagejedalaraxavenis.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/lexuregeke.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5f29cf6f---73421909452.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41394211605.pdfIn PDF document text
    • http://miminku2.com/contents/files/bowopajefigolakerowele.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/fezolukasiwosem.pdfIn PDF document text
    • http://fullx.net/files/25076663568.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615803ce5fcdc---puxemorubadisulewelulu.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/90806364281.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/66657717956.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906182623.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/gewagikokerowig.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/10894751585.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/83453119755.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/vepar.pdfIn PDF document text
    • 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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 10612 bytes
SHA-256: da71fb5c38c17dbbf21c18f909c1bb0da551d3bdcfaf691aa07f24ebfef5d9ee
font_02_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 17524 bytes
SHA-256: cfe4cc8d984fdba26e4fb63ef805c249088bf9ca3e2c6ebaba2ef60e7e63c0ea