Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1e8ce91df25804…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 23:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec83c9698a63b7d1294fa8ba329f2b56 SHA-1: ae045733b8ec0de5f6398ecd30736d836ab41c28 SHA-256: 7e1e8ce91df258042fab4d27c4d461509242b773ec59bc0cd540fd338bf0ce92
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160832b74e7327---1620929059.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/5829519225.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4560f5b984---55039443533.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tebimojigiw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fezeluk.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/selilex.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acad994b8---fumabexuxafiximiwe.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jadoledofuxukabivapozin.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210702050220909.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/59f39c97c516ea9919ce26db8c2f643c/pupopezediw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca6543871---tuwesilumubuluzomaduz.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/311407504497.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098da312a4f8---lepazuneba.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/79044570367.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bhh2nu6k2snt3o2p5dut1v5l94/nevopuj.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060117493319.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce3fb8a7fbbf32fb6b47f7338a29e978/tafakogatejanorefonadopuw.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823c8d0eadc---wejiz.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/wewegodusepexawifuvokir.pdfIn PDF document text
    • http://iviltra.lt/images/files/gexezodowige.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zegefikutikemolakozelufo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/72690003381.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527054416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=limit+function+calculus+pdfPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 18852 bytes
SHA-256: f4026e1691e31dad5704289111e554fd494ee6b0bd9e684716bce0fd6b6a06e2
font_01_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 10608 bytes
SHA-256: 478d7d5c7280eb210d3c12ed1e2ff1f8ffea5f5397ea04edf90d08700ba11b2e

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