Malicious PDF — malware analysis report

Static analysis result for SHA-256 e832497884f222cb…

MALICIOUS

PDF

96.3 KB Created: 2021-06-29 10:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4093f0235478425f67cfa86eb8637cd0 SHA-1: 52c8571bd52199a08222cbcfdb76ac14dc3c5ecc SHA-256: e832497884f222cb66c99283db54ea2453a3b9e8e86314e67c62ccfbd6727b74
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160978acf6b2d7---22457081223.pdf PDF link annotation
    • https://istanajpdua.com/contents//files/wezuderapuxuditavexu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1tap38k3pkcv5k7ctogs7ffd3l/paruruxagu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8cd9ba2cc43c842e1da7718f2ff37df1/84728420762.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e4c9f346---dedon.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160931c441df37---zisukupirinuzewaxupuliwe.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/91255795383.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/fc5c76e827122585001f66f0779494dc/navipazama.pdfIn PDF document text
    • http://stevis.cz/files/file/62232126248.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33a0120b547684b822aa3b899441f7e9/15251817937.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2366048116---jerepalaniwose.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/zuvibifunilulezekat.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f38cf3adace6786bffcd26671bf30999/padugepul.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/warebu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/240763d89f04b2a0f2cf4f4e01a77efe/39296001291.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078277d03064---luxis.pdfIn PDF document text
    • http://furniture83.com/upload/files/diwefebafeku.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/nikijepijevodidegepe.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/88440742753.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/rkmlfl8iihpgthfdknj1khivjg/pakemoxazizebevuredukadi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b9e23716d6c500fd6ed700321766b365/45103289268.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abc111e4281---5932431063.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210525141944_553867379.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/fajixodiwigabupekegagini.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/momejinexuvigaf.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kuu641bqgre2a39p47m8to80ed/metik.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/lakige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jibby+by+the+park+bookingPDF 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_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 10656 bytes
SHA-256: 1c34df997ff2b1435872ef569a8bcc1435319845d3bec194c47e76e82df03e44
font_01_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 18400 bytes
SHA-256: c782f15f230d497fd80c23da596c6e8cbc06f3baed4289e6d0c396adc8e16ca3
font_02_sfnt_off00015ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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