Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e3c0ba15d7491…

MALICIOUS

PDF

83.5 KB Created: 2021-08-27 11:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 36fc3ab713f78d6838bd7f2bb4c364c6 SHA-1: cc1dfd0813900301c3e6ec7fd401580cfdcb78b1 SHA-256: f52e3c0ba15d74916a44174c1b44cd63f624ecdd3170b6ce5539d2fdc1c70cd3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://irina-beha.com/ckfinder/userfiles/files/27337150800.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609695a3cc36c---40691307755.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1fe843a84---37270960469.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rdo3ipida6vovgo0i22qs1af22/dimonidajajetek.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b8osl6ecmnvqipk5edkic30oh1/72694691006.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/podirovosabifaf.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/duropujajopigolixob.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b74de92464a---polulebisevowewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c536cbb748---tekowubugozafuwadivosesa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db97b25c8---rivegup.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/5210897723.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/gonudusofarelixizasutup.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/xewixevofosozorurukevev.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/43166993619.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/tejukeni.pdfIn PDF document text
    • https://tsegypt.com/file/migutuledirifuveja.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/43997418674.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aaf6a3673---ribuv.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/xisikigigobiruxarokebu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072cdfd51ff1---fowerofamagaselixuku.pdfIn PDF document text
    • http://schokozentrale.de/idata/93738643291.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nutuxabevijipejap.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202176915222644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=merge+unallocated+space+windows+10PDF link annotation
    • 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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 11044 bytes
SHA-256: e869897cbe3660cf3ce3921eb4de60d91606ba55d21fa4ec1c79bd0e2eb84798
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 16272 bytes
SHA-256: 52572f996f26ff181dae043034dd5d0cb8be27f2290daf4024f89e758b5d4a3a