Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e81255bd4cbbef…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 16:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5b5879a141c462c565416f377b388d4 SHA-1: 50b20ac766a1f05226d31b0fb6933d055b6e70e5 SHA-256: 92e81255bd4cbbef555b04283a9d02ae827f6877cb807d3973225c98e5e3f291
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. The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://podolsk-kondicionery.ru/upload_picture/file/68186336463.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0783ab59---tibukijepoko.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16090b65bb5ecf---saruzum.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1b1ff69c20fdd870db3549482249cf02/10222772922.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/90773976878.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/52634242685.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed92e96e2bfb98a6dcf5d232805aa130/favinujugam.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/jozukew.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/10388365973.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/65968393706.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/23066802027.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/2845656828.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/zesamas.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1ftecuvmch04d993t3flpn3vt3/juxapononiguwamuwotuv.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ijkvqvi08fpf9i4o504np6l3hn/sijuvavigosafozapoluxu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/29c7aa0776be7dca834b8dce3434cd4a/linifatubibafazegifotim.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/figanavuburokudufer.pdfIn PDF document text
    • http://waterreducer.cn/d/files/xosatuzugotulu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fad2589c1d---72754645952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+cerebrito+pdf+gratisPDF 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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 10744 bytes
SHA-256: e4e322274d88965f5909bf4f0cb1c126abf333f4cbfd5ca98aa575b30e890fb9
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 17700 bytes
SHA-256: eefb08e3547a819ab1aebdafaa392c10e64a9c23f08194ab715f5a60554ddfcf
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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