Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab100c07c3f9640…

MALICIOUS

PDF

90.2 KB Created: 2021-08-26 04:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aec72542c84205081a5e28e8bcb7ba13 SHA-1: 6b1e5f198350f90406b511aa79cb93f143a0ab41 SHA-256: aab100c07c3f96407e1e814361361f6add693f01fd1951fe5aff53836f899c2a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also functions as a link farm, directing users to multiple compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2664

Heuristics 6

  • 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.
  • 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 http://besteva.com/upload/files/larisilogop.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/56285426301.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jepupazijowujaw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e1327e6a8ae924c203f0e0507a531331/polipobatep.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748bd72fb3---pazojemazeruzefe.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a931a2d349---21161219740.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xobuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540fc31f1d---xumawiwavilumajazofupajok.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vovodupatadivexajabew.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/lafekulif.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9v8s7rgf4ofap3890gqfjcmmtu/ranezom.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_180956.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cbv73f34b7qkup6k2i8at63tf6/74099098225.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/jutapigoduzujo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/72509f0b4e773b0118ab566c50527d8d/binatizojofe.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/59185013355.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/56931032790.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/37740506428.pdfIn PDF document text
    • https://anup.bo/images/files/fagipebakaribivugolasex.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/68918280697.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3c7e09679---musibez.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/43897814843.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jgcu01ubv6m0vsq7enon1veekv/kidabiwewudurizole.pdfIn PDF document text
    • http://wjcopy.com/upload/files/85773680192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=words+associated+with+redPDF 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_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 10396 bytes
SHA-256: 1863b87cb6e9b01a874bf340ac045b1007f8730101c6191e860e50b54c4d3fdf