Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5466af053b6a7ac…

MALICIOUS

PDF

79.7 KB Created: 2021-07-30 19:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bec09fbdd47d5ceeafaca60abe66d8d SHA-1: cfd6022efde69e37c5095898f60fe0f64e2b0d6f SHA-256: a5466af053b6a7ac3d161c72336f9903b3281c15a459499b0295e7ecdba8acf5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a link farm. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs suggest an attempt to redirect the user to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8590

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://horizonpestservices.com/userfile/74029417157.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92fb3aac6---70399998890.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/31820458567.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/88644df798531f5d59574072beb6f859/9593278078.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/7on5dmeds2svnf8ao440kbsbiu/53824040520.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2124f310e6---verikatolelupijag.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/fibokotagi.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/digezazesumufefiroti.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/37643920565.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jkdgkok51tdcpcar66qsj3beel/31265492249.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/gekofofazi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a3d710984f69a3a28d29088f932a66b0/58371521205.pdfIn PDF document text
    • http://schokobrunnen.com/idata/korowuf.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/008cd89b50ba687252bacca654901bfe/rojukirurumexoruwo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd365a933---22627571996.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f045e99e8---pojeboje.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/pezerakiniratinijaj.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/12854324953.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/xukezifakoz.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/xexudixapufelepoxumiluvab.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874878a60b2---46275109952.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502003801_1374618276.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/97119357577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cu%C3%A1nto+es+400+g+de+harina+en+tazasPDF 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_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 18088 bytes
SHA-256: 7fc6c8900046e9f717037514205975f0df310f843f17f6c555556f1729134cc0

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