Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e5be2c4d4759c9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6204231a527425e1767c1ca8358086ce SHA-1: 4e86f0a1bca37d911d7425348b61f75176784863 SHA-256: 63e5be2c4d4759c9ce3769744edba1a750d6f7c85fa0e9f7d7dbda447df34f09
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of 'SE_LOLBIN_RUN_COMMAND' suggests potential execution of commands, possibly via embedded scripts or exploits, which is further supported by the ML classifier's high confidence score and ClamAV detection. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=app+store+pc+windows+7+download PDF link annotation
    • http://vatlieulamnha.com/media/ftp/file/70616846702.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kemabejudegevenogije.pdfIn PDF document text
    • http://africareview.in/userfiles/file/22295104564.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161330df76edd0---91329940003.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r7jrt4ggrqislp376jfji8pcfo/watapifapaziba.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/78735213114.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210906_B7C4B06376E1D84D.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/91441209272.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gufira.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e0c8c65211de78b270a90c4fcdf19ec9/defenizonavogalagutewaj.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/64663144924.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/kigikigaj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136e84f03cfe---46953248365.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/ropejudo.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vajeziwosikupudeti.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438b1955529---59978595126.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613982f89bff6---93374927561.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f5918570---7156985001.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/15631077833.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/90420066604.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7e09e97b---2526818625.pdfIn PDF document text
    • http://sun-eko.eu/files/file/mowagituwome.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/wegegasidoz.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/divobip.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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 10624 bytes
SHA-256: d32fef7fb9c1e3143e3d609e30d9ed8128501f4876f5056a32699bd659621bcb
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 19036 bytes
SHA-256: f4c11a712ff6b4d276c31d1002ec65083a92a372e50ed116e3cf2171ede5184e

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