Malicious PDF — malware analysis report

Static analysis result for SHA-256 2040eb90ddb3e8af…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 12:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9828d607a68e673cbaa53949e3952e5e SHA-1: dd76434353404caeed2f875d8ee557057b148ed5 SHA-256: 2040eb90ddb3e8af0f990d42ab7850bd46b28a7456e6ffb245aaf6646f64bb1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://infrive.ru/uplcv?utm_term=criminologia+empresarial+en+mexico+pdf PDF link annotation
    • https://intersat.lv/files/file/vobamatisatozafofusemize.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/38cb4307171bdb9ddf920bfbec3f59b9/90998547589.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a6e7c90de737d2374e75dab0d353b0e4/25173056470.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/54812289164.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/42909434588.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160753fb3be901---limowogani.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/jiwezofaseja.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/00d068de868d118ccbb4c4ad4778ded6/9772035959.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/jikukix.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/76347086332.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/60365050366.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/35248966012.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/72868217215.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b60172bc---bagibifaj.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/tuvepuxewixuporibegolikof.pdfIn PDF document text
    • http://hms31.ru/img/file/51975746605.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/rolab.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jkfs9ie1trs509j3mk8i8tlk9i/papukagunijiwujesaw.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/47595249566.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/67536368207.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/degip.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/latawezuxixe.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_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 11000 bytes
SHA-256: 5e41b9723058a0f6296364445b1e07708839e3a93a7a583e13278ec7e502f69d
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 18352 bytes
SHA-256: df67001555eec9d7b5f882f3db4ac9f397af404d0e861082057e70e86fbe0fab