Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e7626d3ff3983e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 14:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ab24026153660878651a6fdf598df35 SHA-1: 03a3951840aa91174cf0a95ff12258caae11762f SHA-256: 47e7626d3ff3983eca042c84a57680075e576fab39ed22e4ee70b4d202e3d259
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to numerous PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS firing further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://comtraining.cl/userfiles/files/16206458066.pdf In PDF document text
    • http://nw-line.ru/generic/uploaded/62269564715.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/cb079ea189160ecfa919060a4ee0886c/legisadudelavenadulabe.pdfIn PDF document text
    • http://rafaelokazakov.com/file/zababirof.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/4307957045.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/43311150307.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29262c1c7---debejefefivofawaveraxefa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/86ae4b387b9a0e67e6a7030bc499fa96/dajejumedoko.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5170aa7602242a85b5101f3871bbecec/66596617263.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cac23e017---kasan.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/murufunavatejir.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/kikeneninuk.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501224425683053.pdfIn PDF document text
    • http://change4best.ru/upload/file/jafej.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/74134976881.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/23362868610ca22b4b138.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/6135764232.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/vuvelikopekamajaju.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c42a67659---zetepekav.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/12824a652dfbcc4d82f7c695e8164d3e/pawalasorupoguxit.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5f920e025f090a4384d81187ceae3d04/pimabegagojuwanoriwi.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/sufamipekaponemo.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wekinexowegisixapin.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4bemqvfkuunees2rat5l4prdr1/kowivipuwejuwukudaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bsa+merit+badge+books+pdfPDF 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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10976 bytes
SHA-256: fbb0f40b0cebcec1b6be3bfe9131b97343bd5ce02acebda75a5d9b52598c41e9
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 17744 bytes
SHA-256: edb44023683744bf36a14922396badf5ff6681042374c0c5c5409981cc4e346a

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