Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb5e034d801689a…

MALICIOUS

PDF

111.9 KB Created: 2021-09-15 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47f1f327f56e426da70acd6465209d1c SHA-1: f7b9743e63ecd0a69cdaca70907d183c7b1339db SHA-256: ecb5e034d801689a2940bff5edda184a4e3623b9fcad49158c092a4b4a1eea5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://allytemp.ru/uplcv?utm_term=definition+of+research+by+clifford+woody PDF link annotation
    • http://ph-easycome.com/userfiles/file/nobavapanijapo.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/rudamemow.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/71677625489.pdfIn PDF document text
    • http://isvpro.com/custom/files/medifigixedetapojado.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_E8949F6D2DCEBA0A.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/67988881494.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/13635440302.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/99282169176.pdfIn PDF document text
    • http://www.heksan.com.pl/file/wezunomoba.pdfIn PDF document text
    • http://uhorder.com/upload/files/29063042640.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xilizazibemimovejalav.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a270fb2155---bodipogazokozelabile.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/34767232695.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/64166766823.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/50681469392.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/98067114714.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ed77f5a5---negilob.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sowip.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/36551879335.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sogutenufaxomol.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/46175695392.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/pujunaj.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/liwajaziba.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/60463045413.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rubos.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109111319299885.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/reminivunemasesuker.pdfIn PDF document text
    • 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_off00014d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16573 10912 bytes
SHA-256: ce468bac0cae3f699a155593b4c9259950f2e330c176a252dc63e8ddf22e6ce7
font_02_sfnt_off00017ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBB 19364 bytes
SHA-256: 10d025e372bc691a3b882c9050b8e71a207a59dec452b8a1ecd010eaf958b0de