Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21ac3727853e68f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 13:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3acbdb6b5be2b9afbb64c397be0e9d62 SHA-1: 183301f0707913d5b6a082680125da726b518af3 SHA-256: d21ac3727853e68fb1d6378ff47a5552d29656d1a0ee783f82bdbc0f7a407b89
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS upload directories, indicating an attempt to host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

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://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726416e6796---39861542191.pdf
    • http://videofilm-tv.ru/content/File/21775818633.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f44685efa070a04a1b184fcde84fbc03/83950545297.pdf
    • http://grandp.ru/userfiles/file/goborogofazapige.pdf
    • https://exihomes.com/userfiles/files/lomuzukedudajipubu.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a192d279651---gitulininil.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6670f6651b---seximinomazedesavoga.pdf
    • http://mousike.it/img_ins/files/82477608653.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dja0fgl4vqd697kchr496qa6p6/kunonusupatafosuwe.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5049f3bb56e0c5775cead8cfe4c15d08/rubupibi.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43cbe5735---49895419123.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28608334a0---16279996427.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b105abe4f914aa519fb758cd2f86c9f1/18345210875.pdf
    • http://hhtaitung.com/CKEdit/upload/files/radaniwimesel.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pizubudikesizetub.pdf
    • http://www.puhito.hu/uploads/90068325524.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/23btu9f344sek8lbhl9f946429/pabibagemoxekedefagi.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9ae86f6a2ed14e9e55e576163a891949/28020986959.pdf
    • http://chapelguild.com/images/usr/55130787960.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/mewejiw.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/76cf2b37ff773c653159326e95717c09/27318427634.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/numikopinebuzoruvinoki.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c1h4ftbeq3ojmurfnb3e5cl8me/57094949616.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5280cec1---buvitidasumulin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=who+are+the+3+most+powerful+greek+gods
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b4.bin
a6335b6fa1e57a7e8282cf0cce3659ff764ee9764b1871f3e44c8724daf9abdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 17084 bytes
font_01_sfnt_off00013154.bin
d50c32e936a95ed374b7c69bd2782452024c622d54f20aff4c46e8afc33fbf56
pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 11192 bytes