Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d167aeee5e0a6db…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 05:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1cc64f8fbd9e1b19758fd54e3355b02e SHA-1: f7ed1fd03c519feb1fe4fd155f75472361cc2f72 SHA-256: 1d167aeee5e0a6db4982923460987cece02c5dffe7b5c850146151575f889dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware or phish for information. The embedded URLs are designed to redirect users to download files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://its-bulgaria.bg/files/file/zemojemifikidudorileje.pdf In PDF document text
    • https://zhavezbozi.cz/data/file/fobopajitujil.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/43824907035.pdfIn PDF document text
    • https://ags-car.com/upload/files/jabuvofomedewoburesu.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/5742774380.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/56039301865.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6e086b57---10279928945.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/dozeminix.pdfIn PDF document text
    • http://email-database.info/userfiles/file/1832418091.pdfIn PDF document text
    • http://live-net.it/file/81214766095.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/62987939227.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/gegese.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_010024.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210901_033552.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448055b486a---zujejufilasufoxupi.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/tolubaxalojaxamimudegu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/taxokulugudisiluzevoj.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/7440490280.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tebatalavuxurotafut.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/wugujukamebewut.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/xidot.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/86231359623.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/bufogupexisumi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130367335155---57982225202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cod+2+download+free+full+versionPDF 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_off0000b75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75C 10652 bytes
SHA-256: 5d34d25c6cf99070d111a4f01496adc56b2df3e0b4f7e13abd10c67e8bd46d19
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 15192 bytes
SHA-256: eac0faadc34047731ce878713f87d1870d77000ab8a9d6f2ebd6e2b96cf4032b