Malicious PDF — malware analysis report

Static analysis result for SHA-256 1527d48a48323397…

MALICIOUS

PDF

111.8 KB Created: 2021-06-25 19:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9139666a68dd97ca66811a62c628672 SHA-1: b6488163452c887d6e322fa54265cbf1ce2ed5e2 SHA-256: 1527d48a48323397df27c430d47fa004c1ad1311ed0f46e19600d99716b80d9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's used to distribute further malicious content. The PDF structure and embedded URLs indicate it is likely part of a phishing campaign or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072837222d63---wexupufit.pdf
    • http://lycee-elm.org/userfiles/file/zewejaninoge.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/8tjb21t20cegk273htv0otto05/delimosokizoxuganiwuxija.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa68cd9a2---93206897415.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6bfb59dd05b3ca716cb009486c05c6b7/81811617390.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b2410f8d---gisanoguluvubadorip.pdf
    • http://atut-biuro.com/uploaded/file/wavixewoloregovejaxosazu.pdf
    • http://abovomedia.hu/_user/file/badevopo.pdf
    • http://www.520amis.com/upload/files/87257061564.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u7ubikpmk6ga2ljrga4km2jl96/golobij.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/au0doa5jkia56lgoao6rigcu84/wijugusakofutaleziw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa559874d---63323146316.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/32n60h6hkta8aip3ca4htg368v/numowezefodotovamene.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62662898801.pdf
    • http://henri-ruch.ch/doc_pub/file/5638221638.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e863a9354754a08bafbca500126bb384/tadowodused.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071197a76df2---piroluvubibi.pdf
    • http://aarogyamedico.com/userfiles/file/bujojekakubatip.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa846b71a82---vefuxesiluxerudir.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd94e53782---46785201513.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c56d4208d---18822971765.pdf
    • http://bosch-service-center.ru/uploads/files/78468029391.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=old+time+religion+the+band
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154c3.bin
51ab9600e03621b68b945ec4cb174758e1393d1c792d1002bd1cbc3e1864f23f
pdf-font-stream PDF embedded font (sfnt) at offset 0x154C3 17260 bytes
font_01_sfnt_off000181f2.bin
91d9ffa4271531d509afd3ef2705f8c83d77e2de10b0f93b891baecafe704fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x181F2 10692 bytes
font_02_sfnt_off000199f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x199F8 16792 bytes