Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d154e9a04eabeb5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 09:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b967018eba138c503666a43f300c2843 SHA-1: 2bf335ca18e9a208835abcbdd98cbb898767251b SHA-256: 4d154e9a04eabeb58b33e6a3f02cc3869922dd8a7e5a081cd1b773d62b06ca08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The primary attack pattern appears to be directing users to external malicious sites, potentially for phishing or malware distribution, leveraging a technique similar to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=pc+action+games+download+for+windows+7 PDF link annotation
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/sesekamezililaxiwexiso.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/81896926085.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/25082538761.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ce0f3b24950110b5c106bf3882baf3ea/30660877663.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/31671998888.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/85375914088.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109241210444074.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425135ce561---ridakukudoxisegeruz.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/657346345.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/63127979590.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131571ec8cbf---gefoguxiredibogugo.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/vubejira.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/22/file/20210922_020804_144.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/zaredamofufivabo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e80a088a7---11506054537.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/39599609159.pdfIn PDF document text
    • https://terracell.info/images/file/61525727270.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dasekavatipozejonel.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/xofewijowef.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/dimiragedenozutinav.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/munonugidejuzekevokonijan.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jinoresazinelonufuj.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ef1n4liucoqfggvvhsrq0715lh/pinaxetuzar.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142272705124---52918157728.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/8982779731.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 10956 bytes
SHA-256: 76da6705af7d4d6d49d68822e7188ebbb710442cb186f2fcf8d653f6caed7671
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 17640 bytes
SHA-256: c6a3787d346b0a05d6ff0933daa5365b7d05c91372f9dd7fadb66a6cbc6c7567

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