Malicious PDF — malware analysis report

Static analysis result for SHA-256 357c5d36082f9d15…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11e62bd276d7d19a5d159d1d67679f7d SHA-1: fc48f5dc4bd43b5297b6aa5331193074f9d121f9 SHA-256: 357c5d36082f9d154991de9835dc81f99d4642a5ac57ff8b6fb4dd929b4787ab
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. No scripts were extracted, but the structure suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://nomylo.ru/uplcv?utm_term=thick+african+hair PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0551bef8609cd15b6f9e1709fab264da/temixigozalabidodefatadis.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b09597b85923b8728bc03693518f8f0b/tilibotukusavinawuxoriwul.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vuxopokijibazovekijo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/rasezagevusavolokuke.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17cb411ce---58466299080.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/xesironodoperuvalatezisa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078807d075b8---faxaguketufuzogud.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ff606fbb---susegirojisowuzodiwabefad.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081729719f1b---93945625916.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/o59lrfujgjgfmppgrq0nt2en64/newekilizib.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/75c377e1063bdd62c182376cccd9e818/wesujuvixojoriwe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51b19f50c---23686096423.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/7011824124.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/04941ea8de7d59126d0a223e25a7e730/20868530990.pdfIn PDF document text
    • https://wsbtitan.com/images/file/gokizutijetegiwi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c4d0c473---31586410758.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/4325604755.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xuwurugevugiborugexijafa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vak6l2piutoatobfnemvb5cc97/nunezatoto.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/17195153301.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db7531677---mobivavinewazagigenofam.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

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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 9924 bytes
SHA-256: 94d3151fb816b32466cc03a25a6513eaac13e0837a02824eda4b9f8d6b2d0493
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 17652 bytes
SHA-256: 3a1a2bc8e32f132a726d6f2068e673e47eac678c684da492ec336cc498acb8ba
font_02_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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