Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c21ff1a050d12c…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dafee04b10b7fc55c9b4dc8c2ee724c4 SHA-1: e9b71e5d9932cf8bab5754d6f2772dc977c6995c SHA-256: e1c21ff1a050d12c71b7b1bf1ba30f5424db951560090fcfff2751a5e45822fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary goal seems to be redirecting users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ch-yang.com/upload/files/fifufolipodasukadu.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/67837569590.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210919_A285ADFB7CEEFE1E.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/lazeju.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/42178038374.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/kumezalakod.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wijovoxezugoniguduna.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/50476998216.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a41fb69731c5430f03997b8ca47b30d3/69873073513.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/91671891182.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jekuwili.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/gopodivepitagosupezuso.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/52068427050.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/89518302625.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/89229391336.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gobufomivirorujaxowepu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc38c2518---revokukupewetosusuxu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/20934976877.pdfIn PDF document text
    • https://unitjaya.com/contents/files/tolesogefu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/gejugumivupasavuvifilol.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df50e2c53---letivazeku.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/bonevegibule.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/50121747514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=transition+words+to+compare+and+contrastPDF 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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 10680 bytes
SHA-256: fc62723cb93eae6fa836d988dff7d880fc2037f1c0f571582c50d4ed889df0ae
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16740 bytes
SHA-256: 443ce174e4a9cc6c142520cc51c8f3fac0244e79b2c4bb8fff9e3c6d71bc1aa0
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1