Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91fd430890b3be3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 00:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 478d25929a7c94cfe0ccceb5f4b22fb2 SHA-1: 0474675b3ba8b9760d3d7bd58e07997204b8f267 SHA-256: e91fd430890b3be30a8b572ea9ff10e44fd739efa9a987a2846f0c8023ec9a0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dspec-car.com/js/upload/files/8022978359.pdf In PDF document text
    • http://t-eamplus.de/web/editor/files/24038916714.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/14686518933.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff1d882b6---78246108897.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070428017775.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f8a242ed---favufinumakobejux.pdfIn PDF document text
    • http://minerva-collection.net/files/files/xadikelamusanavus.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84189a67b---71005229849.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/55211450300.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/pepebogirakedifuboge.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vobuguzefe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec213f126---fekazoxarenavoj.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/51791046469.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73917571000.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/51645512254.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wilotodonivisotasegeme.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/bakav.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/24208325866.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/goxanokujuduf.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/2643101814.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109251909018409.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57284793408.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/sopiwivemib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fxguru+mod+apk+unlockedPDF 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_off0000b5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C2 10768 bytes
SHA-256: 2698a4ce36db112b2b85a86cad0f3f4371dff9c0f3c502b2beb2b5d62389afb4
font_01_sfnt_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 18592 bytes
SHA-256: f3c94204ff81eaa314ec2192c213893b14940d8b17f393cc0446a223857dbe5a
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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