Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12e5f58f371c721…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 08:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be3575c11062fcd2e1319d33b4dc50bb SHA-1: e19794bb16407df09f02d55433ca4fca664a14ce SHA-256: a12e5f58f371c721216626091219ad6c5a1fa9e646588b051b30710417eebeab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=the+missing+piece+peace+in+your+life+pdf PDF link annotation
    • http://agiusfuneraldirectors.com/files/file/dakajugunopuponilamasedu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/japavof.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/93346619335.pdfIn PDF document text
    • http://sartor.ru/upload/files/57695161259.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e92c145ab8---89358696053.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/9103839742.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/39304698608.pdfIn PDF document text
    • https://edusfera.pl/upload/file/mebaribul.pdfIn PDF document text
    • http://chapelguild.com/images/usr/3186457571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097237508c91---22813787248.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4261d731ba27a6da3b07de4944f44164/45594346142.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/momulawutewo.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/ruramifezisuso.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ehpkettqskoact7jhivhn3i50/93340054630.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc7904364---51263556346.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197d3179cb9---63569560106.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/pidevazizulepinuxuka.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1cd7bd46---zaxefubukitafumikonope.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lozudoruxis.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf8f04ab5---84874837278.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021083010343452.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219903b9e9---kojoxazezaripuzufodo.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/37721141088.pdfIn PDF document text
    • 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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 11148 bytes
SHA-256: e25aae254c88e7b7a3080fc3d187704c8eb51e1361ffaf82da29692422dbea76
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 18924 bytes
SHA-256: 19ab3b2c8bf32417e6a86e831cb27f957dc932727354f0fc5530ae5632d89c4d
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1