Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f63429a1e264e6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 01:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 00269bc082e8a65b6abf8ecfe057da12 SHA-1: 237e5e80d23f3b9e4df9092bd6aaa192ff810085 SHA-256: e8f63429a1e264e67b3a7d44c522f87881f8cac1e9cf40342cf521dc59206f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload. The presence of numerous external links and the 'link farm' heuristic point towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mimpishio2bet.net/contents/files/87752852909.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ead30e263f6654959283ee4a2bc03ac/jikaminoni.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/52412528552.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109070211047341.pdfIn PDF document text
    • http://quetthe.com/upload/files/25670297780.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/zovakegegelekizuvaroseril.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/devosoxozobajak.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f263570a048e91698560beacbd7024db/21667613414.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xaxotuvuvotitavafopisob.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6c814ada74310657c30c1088f1211070/14419828501.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kuwilosusasuzasafini.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/juwalanevekumutagokigaki.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/53695161180.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/73508326344.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8969f3b3d---52850073215.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vufofamaxali.pdfIn PDF document text
    • http://e-sportis.com/images/upload/34426244454.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zuwageviwereru.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zetimuligaxenos.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xexovejakujedodowave.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/14765316753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=access+bank+app+apkPDF 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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 18216 bytes
SHA-256: df1baee869a36f3e92f732aff6262167eb1f4231e4614c3b99bbf3fe35139ee7
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 10124 bytes
SHA-256: 6f4be1f175610b8182c4882ee75f2da48540374cb2c54b6e784fd173b9fb5874