Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ddb24c3afc78f8…

MALICIOUS

PDF

83.0 KB Created: 2021-08-03 02:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25e2ca0be02a726cb7e7f948c2ce7a11 SHA-1: accb101c91ae02b110f4024660df63da1be0594b SHA-256: 70ddb24c3afc78f8be167bab301cbaa4273fd660cfb596bd0c22f7eb84da105a
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed numerous embedded URLs, many pointing to compromised WordPress installations or disposable hosting, characteristic of link farms used in phishing campaigns. The presence of 'utm_term' parameters suggests tracking or redirection, further supporting a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.1297

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://infrive.ru/uplcv?utm_term=horizontal+scroll+website+template PDF link annotation
    • http://chayka-svg.ru/files/puvojasuxojezoxamow.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aba988bcef0018b00640f0972bb89754/xojijufoxikasarulosugilog.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/vufotunuvipupeteko.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7293c55541---goruvojomiduwetufekaveve.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/27389823738.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/texap.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3db94dcf---lumimabefexogeg.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fcd7708b---48370104837.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa80254d8---25146109983.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7a727a91f8939eab5281c67ad655fc64/65591543863.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210603092859.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/trn22c1njdq6o0n7p7ikqbfneg/jezoliniduvinasumiverole.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/91a4ab067ace2f5ba6222146a52be39c/bijasizofovalonufofenowul.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/e3d36a71930bb25d9965de696e74f114/4386165918.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/3322915098.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bf30e9f253c1e4a9e92e2c6fb9a77a22/lejudorik.pdfIn PDF document text
    • http://www.toptehnik.si/images/rolixanuvosililopipifota.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/27824506f82c299b0c298e32023171a2/61024838829.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1ec2050e65565b3f2572bb3eac0e0f95/25007916892.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/75923039592.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/92678497808.pdfIn PDF document text
    • 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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16796 bytes
SHA-256: f02fa7714f996fe32d85e76f2e3a3e37b2cecb0f940a67afedb90a963dd72ca3
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 10812 bytes
SHA-256: 85b80d0c347c96e41ec42130f7d82f282230620ae8fd9e796e775095291e118d