Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed65ab26ff171bad…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 18:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de62bfeb821059f64cdc12cde3d07dd0 SHA-1: 888cdf32b5a854095fdc30f3805ec7b714dfa08f SHA-256: ed65ab26ff171badb8932771bf1181c752d9ba5d9e5d6c44066ea1094ddb9d21
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e73712e67c---62372156762.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816926e7aad---25843017480.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/gugidijalavowinedanufop.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vj8ghui1hmlffa77237ipgu146/zikuso.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021080622435748.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/gukagasalobaxuxataro.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/52949260919.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083317d91946---xaduzinoliwarip.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/wuzos.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c09aa61d---duxepipipapopemupekif.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/10882154691.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5564cd524c33ca82f57f818e89eaa2cd/suzabuforerixabozaje.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/wiresotovodotasezurojud.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gkkvjqeeufijrl40c4evulqh4s/xopuvifijinizawu.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62099581607.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/vexijinapakuzajusi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2be8da2d52eaba78d2acd78bff6c4be3/kadavumadenitox.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cbc6fe23---65354818842.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210726_58D7D02850495766.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/ledoli.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279b272b3---23007102736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+pdf+to+word+converter+smartsoftPDF 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
stream_002_off0000c8c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC8C6 17464 bytes
SHA-256: f4e51c2a3383730b6ff25a48cf13467a06f6ef8a03f5d8f9549adfc497355fde
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10772 bytes
SHA-256: b58f4265ac9786e80eb37513a67019674111e8af6131f27fcb67c4fe802ba2be
font_02_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 17740 bytes
SHA-256: 1179411d837d1e24ae61af53a42efc1df3ab21d27ab9240a5aa78e3c71b5e25e

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