Malicious PDF — malware analysis report

Static analysis result for SHA-256 aece8f94689e945e…

MALICIOUS

PDF

78.6 KB Created: 2021-07-21 14:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5186b7e36c3d7e639ab373153afe2048 SHA-1: 65cd04f2004f233e30de1f938f65d47f79854563 SHA-256: aece8f94689e945e5a7672ea57f31872e90131986d133e5cc93eb97b978c22f9
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timebank.ru/sites/default/files/photos/pagefile/nemoxonefetofopozixemaguf.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7f428f434---lumapaforosuwom.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/1003138401.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/29151055311.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ujcbv9disq7pkvuij4e35f2j94/66734402013.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/dijif.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/zavarerutegusamefedorok.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/gelagakobopibatelijunex.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4928634a09012d10556c4a752adc1cd0/92329174568.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/47719516517.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/kakukepix.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/gurifuredelakug.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/33153214014.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e6bfb00c10944ffefe34a254ccaa83ae/28765576402.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/1450850706.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/86965447718.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e2168191dd8---fumomak.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pgbf6pon8gbbbcvcu027r3qn0c/tibovalur.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/larepekuturedukawikumumi.pdfIn PDF document text
    • http://primaneighbors.com/userimages/79518977266.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/88436172999.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ff50a27f---rivoreje.pdfIn PDF document text
    • https://termoformat.md/img/files/5775706017.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/gimibamij.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47927da1b---93880826012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=justice+league+the+flashpoint+paradox+streamingPDF 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_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 17344 bytes
SHA-256: 89c642f2e4091ba9796f727cf440933cbc7215a32e84a42ced69c369c159eca8
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 11260 bytes
SHA-256: 5d6c2b39a7bdc31960c02f64ec7eb966cbaa470f2df1d2650fe9d2f85b92c5ae
font_02_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1