Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdbf48cbc0c8b8a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f50bf532c3c537e2bcafdc2c6c710a70 SHA-1: a0228c403a0d8f86d7122a293e98c19630928cd3 SHA-256: bbdbf48cbc0c8b8aea87b14987c18c1d344ec8315c961d9568445c9f7eb65261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly suggest the document is intended to lure users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=pdf+creator+mac+download PDF link annotation
    • http://ps-chiptuning.hu/userfiles/files/nuwixatolatigive.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/774226346133dc8f4c456.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/67540569777.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133352d04d2d---toliker.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/numabokatekoluger.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/31557244444.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c1873025---vowokonava.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a503386bb---33750154732.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/88749810862.pdfIn PDF document text
    • http://origo.ws/userfiles/file/69501250879.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/66797665391.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/9c1ac76f49d5980851a49212745e7661/jerosuwokigesigozuxab.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/17966912354.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/93878173924.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/42927538411.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/55899971654.pdfIn PDF document text
    • http://hodori247.com/uploads/files/44646868189.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/2870886028.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/35662531901.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1f4d7d5cf1e44299eb4e09202352f168/73583435043.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/44413150912.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/zepoxetilupoxodatis.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gugerimumepenutopo.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/waxoluwiliwiligawupozir.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbdcc4d1f---sitowuregumupude.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10464 bytes
SHA-256: 2af852cf0a4f36bbd1ec05661b5b9c3c14d95fd1a6e6fc310734b7cb757b7865
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16916 bytes
SHA-256: bb3734c0ec1e9cf56bfed65de49e00c7dedacca63205dffe06bfa93a3ad7793c
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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