Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ff4e3e637f00a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 22:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d5e49e91a30a67ebe7d2cd5ce3193f SHA-1: fa8dd58d6257921d8996ad9062992c41b1b3621f SHA-256: dc6ff4e3e637f00ab6933cf47cfc9ed982519319a55ab5082756f76b88b3a872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://garglob.ru/uplcv?utm_term=android+windows+dual+boot+laptop
    • https://mimpishio.com/contents/files/defevibijidadi.pdf
    • http://yjsyrj.com/userfiles/file/dorovawubigavaku.pdf
    • http://carlaschroyen.com/content_docs/julogefoxofizox.pdf
    • http://doudou.tw/userfiles/files/99241516495.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/firiguw.pdf
    • https://vanphongphamhienluong.com/upload/files/29448168419.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/25251106302.pdf
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdf
    • http://www.cavice.fi/tiedostot/files/13847215890.pdf
    • http://duda-tech.pl/dudatech/upload/file/3155555595.pdf
    • http://ex2010.com/uploadfile/file/2021092006580173499.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913192116837575.pdf
    • http://monteconsultants.com/image/upload/File/67763045716.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0564d017c---69267911812.pdf
    • http://asvpp.fr/pdf/rewakewakowuva.pdf
    • http://elosc.com/upFile/file///ITX202109102317062961.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/xizuliluwawexatuw.pdf
    • http://brenna-ski.pl/userfiles/file/puzapirone.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615040f84f684---reluzowet.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/delibigokopesuvigexu.pdf
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/furoxos.pdf
    • http://slesnick.net/userfiles/files/72766481032.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3aafsokcabki3iama57stuv2aq/63401316691.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a62f8dd335a8c9e133078f826282571f/412220524.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb82eadb2---raxirujomezigekama.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s85991oq17os0l68djdvfbi940/55050015811.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 16792 bytes
font_01_sfnt_off0000cdf5.bin
d262aff221bf6fa3d71a9793557b4e890d4ad1b8f2bfa1771e435228659b9d96
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 10560 bytes
font_02_sfnt_off0000e5fb.bin
843b3a8552c99749ad24c12aa02d460d1d3ca7ddd09632a31c8f57f27e07787b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16116 bytes