Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22d6e4d6975d8fd…

MALICIOUS

PDF

84.6 KB Created: 2021-08-07 23:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47be32ca023d196c53d63a3b9c1f33f4 SHA-1: e14d5dfa8d68144c2962181495a94645b38021d9 SHA-256: f22d6e4d6975d8fded9b596fce9a1c1c4b1f79dc17e93109b8d9c2488ef99b7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript stream, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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
  • 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://myphamnanyno.com/luutru/files/vusudofudi.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bebbdcb14370e81456213964f3c61eea/zafukepaxevifixivuzope.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6157ba335c---zukozotemokexa.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e075c592f6c6b6afe86036bcd8730ae1/rapodavosuvev.pdf
    • https://tylbm.com/Upload/ckeditor/files/86587912.pdf
    • https://sayurmateng.com/contents//files/lupudegemej.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/egpf9nvpkkfb1el3j4pbllj95h/13950763394.pdf
    • http://70sromans.com/clients/871711/File/4819261278.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2738742c1c---nanuvediroripesisawakixe.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3098bdc4e---43882433681.pdf
    • https://jackyrouxmethode.com/userfiles/file/jepexofopukunusupaxuzom.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6d364491---nexuxululuza.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965c3012566---jijagugut.pdf
    • https://die-elke.de/cms/elke_page_files/file/xakilerizam.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jetbvounp4esja312cp6t5l6jv/xonobovozesovosakizakomal.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/44206819243.pdf
    • http://musorcentrum.hu/files/article/file/42067619463.pdf
    • http://1night2daytour.com/ckupload/files/5006778147.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9b5836bdc06d1744c47a7af0c9b340dc/56880489308.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cadence+allegro+16.6+free+viewer+download
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/81134148236.pdf
    • 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_off0000e47d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16792 bytes
font_01_sfnt_off0000fc8f.bin
3bc21581a5579fe499357e27df5ab04b8dfb615dc673b3439691f838816af39e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 17224 bytes
font_02_sfnt_off000129cb.bin
9ff32f3384fa59b4850e227ff23f21aeb4d8d8a27aa97bf79365fd350def68e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 10852 bytes