Malicious PDF — malware analysis report

Static analysis result for SHA-256 87723f4179e84b49…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d62808c4f6ae079161052a7efb06b5ed SHA-1: 7f5b2aa4c4f137104d458cba58aeffcbf0ca57d8 SHA-256: 87723f4179e84b49f0f244b758d4407950a492517502a15293ae18738b5f0445
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were directly extracted, the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae8c4201---jolupuvivigipujozi.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c401f70c52e---45995038639.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217b2f8ebc2---xajepakepugijizo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/967477b611392ba4bb54f816f137e693/9890948196.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/febdde2624fca315b90b6eb18153542f/83782951724.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106061026579159.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gowobajemokudakabego.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/biboboledemijiki.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b0ec43a7---numaf.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/39285187413.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/62634347579.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gagubitovo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/69071167707.pdfIn PDF document text
    • http://rentaruedas.com/files/others/97831901606.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6b54e8f352a7f99de16ec49a96785949/71724368588.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/lotemunegetufuzamozivesiz.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/mesepiluxululurenudivuge.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/122234035ec9eb2d4696b5d7e096b8ea/15421702134.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/nesapazoganenagaxesevo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hrns31uo8s4uiicdjhroj6llgb/44650114358.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/55090837313.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/57148414721.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210807/0547513506.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/rutoxutuvikulefab.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/84058829130.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/logutupigenosike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=family+worksheet+for+first+gradePDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10964 bytes
SHA-256: 1ee29228e24e399c192a92f1f750e117de9b80f1c7578894ac0732492c5a1324
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 17040 bytes
SHA-256: 2938a9743f93614e8caef57d3ecb9e952e5f594667a5626b855110a1c61f0b27