Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd86a895c302435…

MALICIOUS

PDF

80.0 KB Created: 2021-07-15 09:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2be0a798dc4dd47e6e1cf3a21044fc25 SHA-1: da57323d6ec5e68b6035a3ac79fbbc67155f7b42 SHA-256: 3dd86a895c302435885aeb7b24c7969002afcb3157fc101af6545b3e757dcb60
124 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

Heuristics 5

  • 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
  • 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://alexdisinfestazioni.com/userfiles/files/17905114610.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/58344245779.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/dolojodegakudesola.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/57042676397.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375b86e5d---52252740347.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c0553ed0389---66329131030.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455b4acff---xuvebinozubop.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/df7df47857acddef678344a362757205/64651230091.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/9041752059.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/30426186888.pdfIn PDF document text
    • http://goref.ru/files/file/38091123313.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e263a8495d---94365588445.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/pisote.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a45bafc39ef---duxelarizutuzivife.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce416baca0---mikebesesopokibemexe.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9hj71kjm05s3e1ku82d9438e4/38115834954.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/kixoxogurexevavizexapot.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bj5uc33shviiqli669hn1e7s22/rawij.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca98c4e5---81255880775.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/marunonibapava.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/xusedapuwibopinawidatinok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=campbelltown+to+coffs+harbourPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 17108 bytes
SHA-256: d5cb894162bc8b0e856a94497c9770d7f1b169f3e5ec0ae245a3b3cee5619462

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