Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8fa08543822154…

MALICIOUS

PDF

79.2 KB Created: 2021-07-01 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be6f2a5b0a2a4ce7dc52da3a1c224003 SHA-1: 7482c0c7e21104d65c9ae822e7de7ccb5fedaee9 SHA-256: ed8fa08543822154b7cb5c167689edb0352784d661c3975177e860c6a5a1d4c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are presented as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c1sdcmbtqjfp2h06d9l8jlomb5/3380541194.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/27fafdf81903f5344a737871b9221ac6/49834386845.pdf
    • https://agronlogistics.com/userfiles/files/96142197503.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/167baaf544e70868138b6c35a6fc41d3/kajunezi.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/694c3688a15abe6e429f7a1be298ca04/nesafateji.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j5ktd0lq0jlikmr1k6473vons3/zunozubogonofapegesifud.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/i6pcbjt20obja5qvt8s9b0ctiu/ninixoluzipazotosaripene.pdf
    • https://tlproduct.com/userfiles/file/pakuwalebugujavowebajubev.pdf
    • http://perles-del-beya.com/userfiles/file/sefar.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da09879b0c---38636770451.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160832df290c0a---95536278608.pdf
    • http://serextion2006.com/js/upload/files/wupozaxexodixajuzonose.pdf
    • http://bilmatbasim.com/userfiles/file/82988753184.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93acc1519---63549960573.pdf
    • http://stacjaregeneracja.pl/userfiles/file/55450781992.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2344aaba---voxuwerebizuvimapikepeja.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gf221912745npfms0ik25oou5c/91709341316.pdf
    • http://www.abcklima.hu//data/editorfile/9126559433.pdf
    • https://kopari.hu/files/file/xunewe.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5m589li147bifullhijrmucsd/42548095017.pdf
    • https://anfauglir.com/images/file/fiwupetilatizajasowarefuf.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e679880a2dee014dabba6153b4a54c1d/lilaxipugowegipuxux.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4420e7086---70351415214.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f013397abaa1a65f844b254f6b319542/nozutaputuxadonofemojovi.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe7b5b863---siriwonerojudufoxabasola.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bachpan+question+answers
    • 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_off0000d257.bin
85021ebe5ed5fad734b47f4fa29fe0dd1720b4abd631c1776081e4d7c5324e25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 10808 bytes
font_01_sfnt_off0000eb59.bin
f1e6971e99ad3e8290d41c5a1fd514127efa9342b9aa5cfd13afbf52ce7cfa0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16408 bytes
font_02_sfnt_off00011607.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16792 bytes