Malicious PDF — malware analysis report

Static analysis result for SHA-256 573842d4aaa25eec…

MALICIOUS

PDF

113.3 KB Created: 2021-07-25 07:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54000d5ea72e5ce75e4e8155acd32956 SHA-1: df7c5867bfec593985a5ef4b88cee5647d2e7ac5 SHA-256: 573842d4aaa25eec9a7a11836e46be755da4888c36f1c24619edd93d33c73c29
64 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to PDF files hosted on compromised CMS upload directories or disposable hosting. This suggests the document is being used as a link farm, likely for SEO poisoning or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4872

Heuristics 4

  • 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
  • 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.halpellet.hu/userfiles/files/megubir.pdf
    • https://inncredel.com/uploads/56847688614.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4d289493515743dfc1f01b76d80326d7/67870657468.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e42a006d5---nejasojejowasonotuvigoku.pdf
    • http://harasim.cz/uploaded/files/86078498790.pdf
    • http://struttur-arch.it/userfiles/files/19842238483.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/tegofebogonofujep.pdf
    • http://amuseonline.com/absite/userfiles/file/gexekejevikar.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eac5c89606538ae335e3fb631e172e8c/11144779893.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uahhnnvd3r0afupbiutnbne9q6/runotiduf.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fn06vvj3qhscn6hlurri2j6rtq/nilamabenelogetalo.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/96025938045.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3bdft5ljmjlr21fmgcmp5v0lv4/kogudamulemosisatozigif.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7p6p713ct399s05qv3da4gf3fd/90521534676.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ffee647ef---17162740485.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf40dbc3f---gurulunefaferebedomam.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9732261b3aeed8706dc1d0162c3366e1/92064209799.pdf
    • http://kowel.com/ckfinder/userfiles/files/1622671763.pdf
    • http://mashtalkandil.com/userfiles/file/66014513736.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb7eb3bb7---69870892334.pdf
    • http://apexibd.com/uploads/fck_uploads/file/vigifanow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arabic+to+tamil+translation+book+pdf
    • 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_off000146d7.bin
0c654547bcbe9262b8a4c29eb7cc203f9d3372a9d2527d0bf94346c2e8d7aeeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 21740 bytes
font_01_sfnt_off00017a4b.bin
32a910c0b2f6256ad8b06c79451438e620ca23aa93df1c871d858b1c94e0c8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4B 17572 bytes
font_02_sfnt_off000194a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194A1 16792 bytes
font_03_sfnt_off0001acb8.bin
653f657a220969251b7913afee57fcf4226729bcde066ddee5d267b0ffb0010b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACB8 10864 bytes

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