Malicious PDF — malware analysis report

Static analysis result for SHA-256 e838c54fa3ba382a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b44fefd8f00557b58190eea88bcff96 SHA-1: 00703f6f7d4695ca37fa78dcbdd64308e55a388b SHA-256: e838c54fa3ba382a0f6e93da2e4ba64f33ab2ba0a1cbb1daece0068a33de6c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to a variety of external websites. Several of these URLs are hosted on compromised WordPress sites or utilize disposable domains, suggesting a tactic to obscure the ultimate destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

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://garglob.ru/uplcv?utm_term=android+apps+stoppen+erzwingen PDF link annotation
    • http://laboratoriologos.it/userfiles/files/garisigaroju.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/89414890565.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/59177566280.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/41514007582.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/42953884772.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/boberojaduf.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5c3c51c9---72164609654.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360b1ad071a---rejemezikowe.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/doxeti.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/temudowapawewolanunedon.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614249f969376---luxotojokar.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090807112873499.pdfIn PDF document text
    • https://31app.com/userfiles/file/vajatalod.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/53806335542.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a52fdb03b---zemedotuj.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffecbe9b4---88960550581.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d56ea169---zaterile.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wituropijulajume.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/914qrp4q9pp5ih0jui99bimmn6/vixikuvimefalulurenezagos.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wugofegupikuxebesokemu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7b748bfb21c81fc4d5993c671283e589/xuzatawanipalejaruxawiva.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sanirozofakagifetojige.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/20569703070.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c31534078---60467529248.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/gewuvakifisedaxuwugu.pdfIn PDF document text
    • 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10648 bytes
SHA-256: 154057a32b682be74100d8f91cdb4187cf122b63414246c8776bf3c07b7aef12
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 17228 bytes
SHA-256: 3baca9107bfdcf66b97cb35e174215bfcdb7c279f8eac7a4f50b84d4aec3780e
font_02_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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