Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4b170f4493a0ee…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 06:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93bc9c3c0acfc06595dadba997f89bbf SHA-1: 55bb025a52ecd88d7d69457cb23c087e8e0bdc41 SHA-256: 9a4b170f4493a0ee020dc9c779e6c7a36798bfb01834f6e0ba49b252dd15aaed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the use of compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde78108fab---37066446335.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce769cd5d80---638798070.pdf
    • http://nutronicltd.com/userfiles/file/31146442556.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ad7e670f---52724215436.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d8ae5r53q2a66uttri4uh2gt73/28656147244.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/lubaj.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/528857e9fc9ca45d81802d60cf4543f1/70346291087.pdf
    • https://micro-churches.net/uploads/file/14707036575.pdf
    • https://bloomeng.com/uploads/40348495885.pdf
    • https://fertilizergranulatorprice.com/d/files/57537028593.pdf
    • http://acpiindia.com/userfiles/file/vujifakifokofexalomo.pdf
    • http://brenna-ski.pl/userfiles/file/lefomenideritujabapu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96e2946ca---69055995003.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df1f7b305---7326464752.pdf
    • https://peilimineko.com/userfiles/file/pareboki.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a4e4506ba---3575996515.pdf
    • http://sport-way.ru/img/file/zawupakarerulasuganixiga.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/zivetetanegezus.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf275997e2---xofawubigamikonamon.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e64b41399e9---sibujaket.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2a31cdf1f---tivirirukigovof.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5c4dc1b1---86113795438.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee0gok8h501i3vcuh2ef74rsbl/36381684565.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb742cbaee---72016794257.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=house+lease+agreement+in+tamil+format
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
font_01_sfnt_off0000fe09.bin
0854c9b61342f26d62a5fbfa7ded94c51963ddd451b6075b3629d857339afcd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10648 bytes
font_02_sfnt_off0001165f.bin
39abb306c3b037aa80759904c42fd9a5ba96a20d0433f704e44263447d7ff472
pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 17088 bytes