Malicious PDF — malware analysis report

Static analysis result for SHA-256 69007aef88e64d46…

MALICIOUS

PDF

69.3 KB Created: 2021-09-15 15:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb701c7ae2af996b017d54510def13fe SHA-1: d01e092fa07cd8b50f45a03a0c44d35c9bf3c729 SHA-256: 69007aef88e64d46938457a57111be033f48bb02166311946c380e6d8456d325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=properties+of+integer+exponents PDF link annotation
    • https://khogiaydantuonghanquoc.com/images/news/file/labilodimawuzixixijopubax.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/vulikesezazap.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/62744783435.pdfIn PDF document text
    • https://grandegroup.net/files/silerenosa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6abb9893---98744842425.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/2213563431.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff4f1aded0---kalurolo.pdfIn PDF document text
    • http://inphilong.com/upload/files/99311680592.pdfIn PDF document text
    • http://foodchemsino.com/d/files/kexer.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cb8c3adeaf8de76854d2102ec647d0ec/lagesuzojanoterika.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/53104995313.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/ponoxonexi.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72376765458.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/75201319921.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/83534733177.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0e0f88c1387d4b6fd1d1fe91b51fc2bf/40540465137.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a8c07303---1565566567.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/55342405019.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/29739959897.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/tozewusukasixazona.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kafex.pdfIn PDF document text
    • http://chieucoingason.vn/files/29241487676.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/93153221157.pdfIn PDF document text
    • http://hueide.com/upload/files/bitowulotapa.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/28133861432.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/33925904957.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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 14956 bytes
SHA-256: bc69c73b3e3eb39432fec852e0ff9c20789b62062847e8af58deccbd175f034c
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10428 bytes
SHA-256: 38c411e8f9e878379553cf1e0b141585a4d4309ed7f7424323004ca348a303ed

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