Malicious PDF — malware analysis report

Static analysis result for SHA-256 008987ca87701fb1…

MALICIOUS

PDF

88.2 KB Created: 2021-07-22 20:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e56cd2ad9c6670899671109e73b6d92 SHA-1: 70de11475283acb7c56e44af27ffb307b4c06b50 SHA-256: 008987ca87701fb1829ff7b000115f81ab2acee4c17ea8f7e88b48ea5081daaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs pointing to disposable and compromised domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/11102794488.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/lajaqh1m88le4v4kb31rvlceaj/kidutibote.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/52871287365.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/55220422094.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f358975eab---nejufilakadakesixaro.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/dawowozalidonusosaxuteja.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/db6fifp927eegn97lkst44c3hm/85234964012.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/47171363741.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/64046447885.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ac0350a3---wuvenazib.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/97753504639.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bodogigek.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de8d55ad20---lafinosazazelufokudev.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/21a8d044c4296f91eff9e79528ba0b8f/vifusopaneraz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/4177924183.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p07uaco795ttu7d1gj1n4gvddi/31798923367.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b051a69268---jerelexavemawotafisa.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zukewaxunotuzukun.pdfIn PDF document text
    • https://area5srl.it/file/46845187556.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/89792460098.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/97974227504.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/84410841119.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kdn5g9g2sks00p7i5vl66gb4ro/rozijelibebuxokisebos.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/j8mpekijs1b6516cbuss3guh3t/muzojetesatemekugotobax.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tibigivumedenagipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=order+of+planets+according+to+their+sizePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10984 bytes
SHA-256: bc00d2790dc8121bb4a3e7c6a4d4992ddf8cb59085482c8ac677e7457da35dc7
font_01_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 17864 bytes
SHA-256: 5ca3590f4d54bfed57b257dab7bd9f6dbb1eeb14cf4d2ad64c9dd5c76c3156d2