Malicious PDF — malware analysis report

Static analysis result for SHA-256 1055748d760224b0…

MALICIOUS

PDF

78.6 KB Created: 2021-08-10 08:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7cec1d11b48b690b0690c37d75eb04b7 SHA-1: c4fd7dd192a5a80d8edf74e36ab830505980876a SHA-256: 1055748d760224b0f32b7e5d128233a44db0bba1c52cc96eaf7c5ae64bb4ef59
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7117

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=what+time+is+regions+open+on+saturday PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/jezetazelebugunufuz.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/gajarubinolir.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c8434ad41b851da31354e85b65a453f4/25927073091.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607960d01f00c---95934058225.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5614b00c3991d04cb4b240ff5585a99f/fabanewopuvugipirogo.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/midegopisagerugikoriwezuw.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8df2218b---ronebanonigujolazopaso.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927943e66fb---garavogatewubaz.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/umjum4ek9sjluvmuc73gl71lb7/66418086779.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03accee1e---kexetimuzafadilalafanijuz.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/mirofelibad.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wilifewaxaz.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/zabakedederadawan.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/wadotaramojimapixe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609accb608fbd---gilalalezewimoxukazetabi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6471bc21327c5784a6f1501e8df9ab34/misodopobokej.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zosexixivuwapopipobuke.pdfIn PDF document text
    • https://biocoils.com/img/file/57101562234.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/jinibojesigovujatu.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubogabo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/movofefamerotomovejab.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/fakiropifinuxibajate.pdfIn PDF document text
    • 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 17372 bytes
SHA-256: 54072160d4ca91c7dd1a975d50574d54da61f4b2dbcef199cbbbd3eda8024f37

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