Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e07b3daad0880b8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 13:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14cc7c31cb8e999158420e5f664fc108 SHA-1: 1600693ad7651e45d786d81882fd6c478a053077 SHA-256: 8e07b3daad0880b8b50c7129d843ef051c6fb885dcc91da241b79aedbac9d90e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=temple+run+volcano PDF link annotation
    • http://ebus.cn/up_file/file/tojupalabedumuras.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sugalo.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/lapiragotofezewu.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/51712777053.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/8239065909.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gelis.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/55886507807.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/24447cb93da062e4dbac58a0d6069cd4/58507577048.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/fibuzagawewegaruxepopova.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143206ce8283---20011299911.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/39888073162.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/sorafo.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109062127526780.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/rofiwogabowetemakor.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/38875759105.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/5890702803.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/loruxeleronowewozural.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351a13eb85f---fikovetunuwagisekasasorin.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907190847.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/34335658997.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/56889851521.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/45682231305.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/fadalewerijofofoba.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 10308 bytes
SHA-256: e7d21a6084afc624757e8b018233ae1906bafa7ca94cc7075d29d39d4f974c5a
font_01_sfnt_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 15644 bytes
SHA-256: f60ecc2afdb0dadec58939826287be7f6577f3951d186c391c7b87de7983e66d
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1