Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc4e3210e23c6fd…

MALICIOUS

PDF

67.8 KB Created: 2021-09-20 00:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1e7332e3d25306605c1b611e441515c5 SHA-1: c5cffd071ed903b416cd1ed7ae6f2e474e20d6d6 SHA-256: cbc4e3210e23c6fdca9cb0736de3aceaa4f06142798f5df6deeb2fb89eec8542
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Notably, some of these URLs lead to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and link farm nature are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3517

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://juha.be/_files/file/52452454099.pdf In PDF document text
    • https://heritran.vn/uploads/news_file/jivupotujore.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/23486479804.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/vegikorivun.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lunajutizimuzojosirotam.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vowafibaxekexeledemisoru.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/46656432793.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/reseronutirugagefewuko.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/4829950838.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/golasufoperigaxufipiwu.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/mobit.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kivamesafopud.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916114606515131.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nojugawoberegababi.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/potizevovoxejopisij.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/rosafusisodexe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473767b2443---63952416531.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613405063e0f9---xenefefedikonegomit.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1bb082c0deb486ca2880b427a85d421c/31333310004.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a851bec28---14693122043.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mifejj5n467ans8bg4avsu8ha2/muvoxubomozubufinuwumug.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/46183922226.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/polisomupalawobuxafuvok.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/42874981099.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/lixuborasizufabefuravanul.pdfIn PDF document text
    • http://checopharma.com/upload/files/29120597342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+an+app+using+apiPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10720 bytes
SHA-256: 8612e557dc3e49000014e53f2d751b2a586aeefc14b9df12c3af94770f2672a7