Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f927340ed072d80…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 01:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d15870f599e2c2f28afdf2e68c3557f3 SHA-1: a03c89c6f71424cfc9bab337110ed1b197b48cb1 SHA-256: 9f927340ed072d8026f60c85667637ebc5894103e7ac34ab18c03aba083cd6ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The structure of the PDF as a link farm is a common tactic to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=can+i+facetime+from+iphone+to+android PDF link annotation
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/39373675524.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/61301262777.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/27567160231.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161425906a227d---69089329851.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pigir.pdfIn PDF document text
    • https://tch.lu/files/files/5123056851.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/basatisubumekefurujugos.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/sajesegenizapalaxokis.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b89ee16019252a951e1f33dbb919732b/tetaxibugiv.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/28885970562.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/30317910988.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/munisop.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tutoparam.pdfIn PDF document text
    • http://synphabase.ch/upload/file/29206744824.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1f1374e1---tovonore.pdfIn PDF document text
    • https://megashina24.ru/files/files/22904591604.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/midafafuluwog.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxutileroxaw.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/22998774108.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161402be5182c0---39023197129.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/tenexalalaf.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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 10704 bytes
SHA-256: 4d73cb8fe88973fd1ffb47ae47e3509ec470ea22ba4a9d8cc73192f941ea0043
font_01_sfnt_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 18248 bytes
SHA-256: a12a1acea284dca1dda9515149d673dabf2289e952bcb9dee76bb634f11f825f