Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc949636639a6427…

MALICIOUS

PDF

79.2 KB Created: 2021-06-14 22:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 06552349a7ad5b62b8ecd783ec19b70e SHA-1: 7ec41e44dc05e145fc0edb468cbda37778c19e91 SHA-256: dc949636639a64272c7c9c2e8c1dabe57786442a725d7ced1d532052fc2af8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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 https://huntic.ru/uplcv?utm_term=ralph+waldo+emerson+important+facts PDF link annotation
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d8d8efdca1edb8fddf06d6b05d756a39/zosetuvuf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/14f36d96081a156e687c2d9a6982005b/zunivudakasapugiwuteni.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/95875419367.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5ff41dd5167608d7eeed598ba1d8a3bb/timatawok.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c684fa962d3bf57b039f011e585f2ed5/51096230167.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/941d597f89dd865a4bff85ee5567780b/sabuzamotu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tupemiwijaribebuva.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/maigdgsoe7q41aa8cfitla33pd/dekasurixe.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9141d87a6---fitibeb.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a88199456b87d6fcfe8601b95b6a4de4/mewunivinopud.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/72ffdf6aefc9d5ef4d97fcc4971ddcc5/sumetuveseroxezomunew.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d097ced38.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ac9888c251ede8dd0c5a27671de997f/zemawiwoxotuwetomulomif.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/85291d284f4623002a281cf7221153d1/sigesedugogevizazex.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/875p7r84g9kf33ffafco7ulgn2/68277295328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 3352 bytes
SHA-256: ccf9fb892202b4bb2088ce8142a4053323d469e40edb26319e9635fab615566c
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5492 bytes
SHA-256: bc7bfdbc3386f7fd30266740488420c0a83a1b432c66ec44e02b99fcdd0a9594
font_02_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11260 bytes
SHA-256: ae8e30aac6a6440acdadb86081806bd291f7cb95fa5e89ff17fdddebef5b9f6f