Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d67796d38ec0c9c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 18:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea864c4d8689961f8eb9057ccd55bc88 SHA-1: 542d0b966e4781afedb04e27eb721577141da7e7 SHA-256: 3d67796d38ec0c9cb0b7f22ddba4b94e0d0f9a1f9586786261d75f8b8a7d5ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=free+fire+download+play+store+app PDF link annotation
    • http://www.oiseaubleu-promo.fr/userfiles/file/39219225614.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/deduxerudifefakigok.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/tixojakesopegutat.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/xujajamigusatogaxiwewa.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/lifesavujixejo.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wutajame.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/87362415905.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/80534586283.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/36234e1dcc953fa5dbe14addafcf11b3/61778770321.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/48064567333.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/29883659301.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94581391906.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ligevepokovajasi.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xilujupunorexozegasi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab7c96fd5---81119426989.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/83015190444.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/87054320036.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/zagirip.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/87804690705.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/wavosexerif.pdfIn PDF document text
    • http://myslizdrave.com/soubory/73843634193.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bovagedoletojutewowajas.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905152840.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_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 10668 bytes
SHA-256: 0d7a222ebd36ced8561804e90d7855cb2f6753df4db5032f6224107714274479
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 21220 bytes
SHA-256: 3a77c83ae22a2bbf956448285e06e7bb2ffce6eedd0ddf3ad6e5f173f8850857
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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