Malicious PDF — malware analysis report

Static analysis result for SHA-256 de646da3897d4a56…

MALICIOUS

PDF

100.3 KB Created: 2021-06-26 19:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35dbc962aa278279a88795346d215c6a SHA-1: df2c32c9c89fc07dad07d5e2178c751e2bc1305d SHA-256: de646da3897d4a567e8804d9af60a487d6d1ca30e439008f61bec6f57902ee7e
216 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing downloaded payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://irlanc.ru/uplcv?utm_term=how+to+merge+two+pdf+files+on+windows+10
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/baxegomilidabesagivibenov.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98fae976c---47829546032.pdf
    • https://latework.cz/soubory/wujifetoposevukaju.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e6704aff---doramixuwivimuvated.pdf
    • http://shuswapladystriders.ca/userfiles/file/55495806886.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dfe1d25c---lobivunadimugutazadutov.pdf
    • http://dnepropress.net/files/file/giwavusixegufad.pdf
    • https://pnp-studio.com/fckeditorfiles/file/lalaxunokisetogamapuva.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1dbbc838---rukutugugodeseda.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f61a65f7e62f2795743390689f5d5866/tifix.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f4bbac48---82078008517.pdf
    • https://liniagdanskzydowo.pl/files/97466376026.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hnfft84k3ghsol7nt1pnk79hf3/xojab.pdf
    • https://x-software.cz/data/file/pekozok.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4a815b85---jotufejagawabijanuwa.pdf
    • https://people11people.gr/uploads/File/89866178987.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e0744046d865b404bd7e44c46e7867ee/19177717078.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/11431064818.pdf
    • http://klcmekatronik.com/ckfinder/userfiles/files/79992243514.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf662408e5---fatenuzijekiwujupajekowe.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16075baaa78c8d---77114582773.pdf
    • http://arohitourandtravels.com/userfiles/file/kekasagisagitexutikog.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17299c0f0---suwokabevumuwuzebez.pdf
    • https://askisan.com/upload/ckfinder/files/gabujisamixuwejawivudized.pdf
    • https://eminencesolutions.in/resources/userfiles/file/26055403778.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/r880eocmjfvb61mtdqev97tq84/51484704845.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010937.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 16792 bytes
font_01_sfnt_off00012149.bin
2d30e5dcd154f43360fa0b0e239bf6ac78572ddae0cdddb04191008016b8023d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 17920 bytes
font_02_sfnt_off000150e7.bin
d765a3d8e6208646fdca73ae01578d6057540a0ff696ca5c5a59bb4cf3226da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150E7 16560 bytes
font_03_sfnt_off000167ed.bin
04b2ccd485314a4e549e67414eec1d002fe7464c6c78f6f4142c628ac7b8284c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167ED 10928 bytes

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