Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33c5fbda4ab9994…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 01:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f5bc7579081bcbb09abce13f5b781888 SHA-1: 9b9519d9b9714310de71a7bef451bdfe438090ba SHA-256: e33c5fbda4ab99944b7e93f2b83d1bf048a2531eca8f05be15b3718733244177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://bbmeti.it/userfiles/files/tilof.pdf In PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/11141777054.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/14215879977.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/84153671094.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/xisefivusosizikutedapu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wusem.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1463102dbb---rozoviwigojunobogifanebuw.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1976c7189715b4ffc43827559615fb4a/95171625952.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e9c525f689f10db846eb78738019af92/574569648.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/42565959a0c3fee08d0f7ccbbaa59606/jedelidebodekanuja.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/4705994427.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gewarudezajupusavufaba.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/74555105355.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa94e9f0a71---sanerukane.pdfIn PDF document text
    • http://artlabjo.com/userfiles/file/4126176342.pdfIn PDF document text
    • https://gilbertems.com/videos/file/rivisoza.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/bitabusinuj.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/20061729945.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608685034d30b---56637074158.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/31883332176.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609222de3b076---42480266637.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/16887924728.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/12451325849.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/52471640397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=prove+that+the+external+bisector+of+an+angle+of+a+trianglePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 17224 bytes
SHA-256: 268fae1de5c5c7fce11b0b1946bd71865893c16e149dbb4a5474c30b336a5861
font_03_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 10924 bytes
SHA-256: be01f3bc0dabbc441b95f168624e855089b0d4b45cf2b5e63b4a19572fe4d23b

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