Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f13ca3a787e2ec…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4523d790be7cac3aaa60c7c7827a266 SHA-1: 3772fe24a202b99f28137bd4d0e755edb45481b0 SHA-256: 91f13ca3a787e2ec27a7e7d3c9556fcc49b5c583db007460a15f061c6a444242
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sio8vfnotq0uf3f5jp7c6ecv13/zuwowipeved.pdf In PDF document text
    • https://travelstore.tn/userfiles/file/petelamuruwegizapo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77b3b4a6a638bdb89b920d433b7ef539/78382270685.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc111eafbb---pesiboxoke.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2f7d9ce2e---93194381443.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/6960523075.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/paletozaxokow.pdfIn PDF document text
    • http://poiskvod.ru/images/file/zuvasefawogukaruduge.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6fc8200ad1d8ffa010b80aac355dd2ad/xudopoka.pdfIn PDF document text
    • https://peterdegendt.be/file/26498305263.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/fidigejakabavedefewapejil.pdfIn PDF document text
    • http://skncn.com/u/files/nefegirakimogo.pdfIn PDF document text
    • https://hojoairport.com/images/file/82315019821.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/nelozevixibevigexe.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/48662566824.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d3740ffca8da415568e72d8fb33446c/ponutebusadokutotelojid.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/wuvojevekebesuribabofoz.pdfIn PDF document text
    • http://195exim.com/datas/files/77340712361.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c46a8631---gipuzokeloluval.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pizupejesowuvenuwerezaji.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1189eb9ae3---8733653006.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/43063458520.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d871dd1632---vidotowudikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+word+document+to+pdf+using+c%23PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 17732 bytes
SHA-256: daa9871f46e0b660554e9477be20e815adb9a24f765cc25a3b7379007bdb100a
font_01_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 11036 bytes
SHA-256: 073c44790f1a544c25dfdcd62dbf475ccb4cdd50fec43c249ed40ed081332248
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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