Malicious PDF — malware analysis report

Static analysis result for SHA-256 8275614b992d8f0b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8469e2ad5ff1683f1fb195e32255325f SHA-1: a66388c1d99b6c29dd74bb118d776488c2564129 SHA-256: 8275614b992d8f0bee44f41e015ea8c466d4e91867b7597293998429dc12f45f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or employs phishing tactics. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a delivery mechanism for further compromise, potentially via embedded exploits or JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gabinetpro.pl/kosmetyczka/krakow/files/bofuveramenijunin.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5f2a9q1s5ogvufjr77if45ste0/56073187894.pdfIn PDF document text
    • http://proxima-design.cz/files/file/16826914258.pdfIn PDF document text
    • http://soupworld.de/upload/file/46441107946.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8cdb2efe5---gasisexopuleramolix.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/rimupizet.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a33a5658---26440799970.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/15206581079.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9279b63868---wadovatulofi.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991595e39a---46356948160.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae4c05b3c---85145276647.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-19/20210619091113801164.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/nopumeninukowovoxa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/nelamanupiw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbc5efe1d08798ca0b899d6cc98f430c/4863268184.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/fizijibomuxexumitovo.pdfIn PDF document text
    • https://birotex.rs/images/files/gifapifap.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/82484418314.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motukuperukenazapu.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/82473594034.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/xitovajidilegizurilegivo.pdfIn PDF document text
    • https://esvigo.com/upload/files/xatolizoxitiw.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/fadevisuduzibojafa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50facdca6e---latudapope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+write+a+business+plan+pdf+south+africaPDF 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_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 11036 bytes
SHA-256: 529b8c14d8490fa5f3a1c6baa8e07018fa4be59891e74de8bb3cbe8a95830aaf
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 17340 bytes
SHA-256: 5ea36098fd68d28a10ca28bd9af06f26dc18104b5fea66c5371d5ff50980bde9
font_02_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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