Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b890e3ef75346d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d41eff8d36d532ec6eb3261d78266c9 SHA-1: b8be03312fa870c3c030b59766ed479199d470f2 SHA-256: c2b890e3ef75346d2093e6c7bcdfc6b307d50515b2ef57e5d4971a27e00e9553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of multiple external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=uda+aida+full+movie+watch+online+123movies
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161384f38e822e---zivewolusupuke.pdf
    • https://dennismaloney.ca/upload/editor/file/gavalitelaxovabirigirir.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/buxolobonaki.pdf
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/95847430424.pdf
    • https://gymlesgeants.com/upload/editor/file/74914331563.pdf
    • http://1carl.com/userfiles/file/remebowaru.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/2693336425.pdf
    • http://westernmaki.com/uploads/files/28936844548.pdf
    • https://houstoncoinclub.org/FCKeditor/file/dumugavorunijode.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7a79d659---96282241761.pdf
    • https://mollis.rs/files/72475332873.pdf
    • http://leylasuren.com/images/userfiles/imagefile/nokefilojex.pdf
    • https://artasedanasingaraja.com/uploadfck/file/kikuk.pdf
    • http://mexxeopaint.com/upload/files/73193661864.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/rikajutiwaxube.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbc10047c---65520853557.pdf
    • http://yhbinternational.com/userfiles/file/wamesixowulenaxo.pdf
    • https://kompaspt1.com/contents/files/punoborum.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/jatanitukepokigilusi.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/xetakiparejixenoj.pdf
    • http://srs-budapest.hu/uploads/files/fupenetug.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/5323724081.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/ligefoxepemodeseludale.pdf
    • https://southafricapools.com/contents/files/13107971792.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_off0000d6af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16792 bytes
font_01_sfnt_off0000eec6.bin
5b09799bbcb22abca72662834ef54e18f1fc177b24fc87214e458efe05a68db7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 11244 bytes
font_02_sfnt_off00010918.bin
4b911bc4bcaa6987d78ea18cc148ab76254f35913d4e14dfec09302792f1a67a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 18012 bytes