Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aef2b1e38b7d513…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 05:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb32950346d60a2bcc473acc7d50a5db SHA-1: ff39c75b3c0e6a97b89dde3aa5152f40053e8c51 SHA-256: 6aef2b1e38b7d513f3fd92cfcf7f2019bedb1ff98f723dc7dc92e5a50ddff702
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'Browser extension / update installation lure' heuristic, indicating it's designed to trick users into installing unwanted software. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised WordPress sites and other disposable hosting suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab6f115fe---87072251539.pdf In PDF document text
    • https://hoakhanh.vn/uploads/image/files/lujutarajudij.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vemigenajonifujidanikis.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zanitulo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/zasunomefexew.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/37441915606.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/75238872183.pdfIn PDF document text
    • http://langyupharm.com/upload/files/51805828731.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210918_A457A60607B05CF0.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/vivopurinopadadovak.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/delibunelimojolaj.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/66245522810.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/77395169314.pdfIn PDF document text
    • http://samtekelektrik.com/files/zerovekubefajupezawapepil.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/xomitumagavijepirozigaxan.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58e2dc096---gerokovemutij.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e6ab029fa3a05a79538b68dea58d4a72/talawokogoniwokexo.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/49316016327.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c7b3c6ce6fb6193008530a6f4f861b1/40430390870.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/juvusetif.pdfIn PDF document text
    • https://blugarden.eu/file/sotinumelot.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/3097724545.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/90476849933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dark+theme+plugin+chromePDF 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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10848 bytes
SHA-256: 6a76316ef003ddee57c1ca16676fd383feb767b88fe4bc9f97b040f1e96d345e
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 17856 bytes
SHA-256: 6f64f5b67766338344af0424875a3d129b941e17d07ef4d9f2a8efd9818e249d
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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