Malicious PDF — malware analysis report

Static analysis result for SHA-256 325092f0d300ec83…

MALICIOUS

PDF

112.3 KB Created: 2021-07-05 19:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cfdf1301d526dd15bec46fceda7aec3 SHA-1: 56135c5553233c07766ffe4c64c61ecb6c6bc65b SHA-256: 325092f0d300ec83bb6f2599dc15abe01f6088f163580152b2014cbad4259a5c
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed that the PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3347

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 https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0177cf1bfd---duzufilasifirid.pdf In PDF document text
    • https://dichvuketoanvn.org/uploads/files/sirisobube.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/147367a50349cc398ad2cfc40f367916/riparifededab.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dekulemevidar.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/27902415142.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/45586435679.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/68297246663.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284737d09c---rawaxujitakoparinuretuta.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160839f1306692---70871293121.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zonudomexorenelulotomapi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b49a5fdbf---xirudofetufuvowujanip.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/18018580441.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/32d0bebba40b9d2e6eebc4e1054c9131/mizitazew.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/32307753035.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/zirenetodebaviluwomer.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tekakuzos.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/73880549.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/penesor.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/30570767621.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/12hof40kug2r9oq63g6nd5ogig/29944172858.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/vunomi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8f4c74ae20b668eef215880c1ea54bf7/2552780423.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3644c434bff686d512d03e37e026c956/15350500267.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3343939041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=after+we+collided+soap2dayPDF link annotation
    • 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_off000161e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E8 18132 bytes
SHA-256: 794507e32b751922b23387122f66b10dad245c774627253b13619b3016454bb9
font_01_sfnt_off000191d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D1 10812 bytes
SHA-256: 533f40baadeab841c76910e2977d5f6e4e8915b8816aaeecc00eca514ce987fa
font_02_sfnt_off0001ab0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1