Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0610b3b97ab562…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 21:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b81b035f134e51ba5888e56577571df SHA-1: 4f2d6b9534b48244b62c6489f9c6edb8a56ef9d9 SHA-256: 5f0610b3b97ab5625f3deae02eefbd60c1f65fcad8cb5930aec4fdd3b24fd787
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://speckrepeg.by/UserFiles/files/35515463893.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/ratowisetut.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/fomofulojalo.pdfIn PDF document text
    • https://hinaweb.com/upload/file/55792332249.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bulisomofemevelokoxenot.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/velidalajoronolumujob.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e08a78825---japexezixijepifajesop.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131571ec8cbf---gefoguxiredibogugo.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/degujexojaberuvodu.pdfIn PDF document text
    • http://retailcop.ca/files/vumubutimurugu.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/94510803914.pdfIn PDF document text
    • http://jinyezi.cn/upload/17740913088.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bfe4d57b0---90947225553.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/xumusegedegiredido.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31845766957.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/tilisonoduwadu.pdfIn PDF document text
    • http://pasaru.com/upload/files/jipuvasatudezagakesotiv.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/64160640470.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazugoxuwizobiwubiwuf.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28577689306.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sagimobasuzijigekegeta.pdfIn PDF document text
    • http://sjanzee.nl/file/13076321921.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/pufufopaviwadizolabonomet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+omega+ruby+decryptedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 21888 bytes
SHA-256: a101cf8dcdf03803d99253db1ef030ffe91743d3fa0f1df4fa19530c8607a4fb
font_03_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 11000 bytes
SHA-256: 6881119b90d8ee30aa9ce4f82f2d1664522c846380174c76a051699d062f6557

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