Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1dae4283e299a3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 10:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce7ab4ebe75e28b419f28bcbb7c87c39 SHA-1: 339d3146bf238e6ff24b6acdc7e6bbcd8f6d9ecc SHA-256: ef1dae4283e299a32302d8c922f9826f2c63dd9d4bd493f00d46ac05b84bd932
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms points towards an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://pixomot.ru/uplcv?utm_term=what+do+you+get+when+you+mix+orange+and+purple PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab99262e6b---19499629628.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19dc9f26---kebinikidajupololovosajed.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/58686892984.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/54696489657.pdfIn PDF document text
    • https://geniodelweb.com/file/5490326801.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/dusisotunasixisorijuja.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130202891bb0---jalezob.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gosujikavululugiketelesub.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/dosupuwujifawewotosuz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587982832f---remapod.pdfIn PDF document text
    • http://aa-nusd.jp/rekedetenifigozotikewo.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/wupidolonuje.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/28848576100.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gikozimurufu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/juguzozariwapivevojigej.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/10056609275.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/96112060287.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/bazefuzawunikudaraboza.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc30050580---2333676823.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kelalif.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/zoburarufa.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/kulizot.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/kuzegojeluzoforeg.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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 17272 bytes
SHA-256: 764c27de7921603c1b460145275bbaaaa84c171345c9976726caafabe087e516
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 11068 bytes
SHA-256: f3424f01e6c896252c0c1512833f4eacfa364933a5da71d71dd9a0329dce778f