Malicious PDF — malware analysis report

Static analysis result for SHA-256 687d00533f0371e2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 02:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ea2238dd960f08e463c29cd24fa1c33 SHA-1: 0f4450e206c599aee0c7ab2733f1702a366b6131 SHA-256: 687d00533f0371e23a0dba5b3bf5495055fb07f155fe1fbbe48b9f2697a03044
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads, with one URL containing a 'download galaxy buds manager' UTM term, suggesting a lure for a popular product. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=download+galaxy+buds+manager PDF link annotation
    • http://bkmarine.net/ckfinder/userfiles/files/1630516463.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/42578574787.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091419234073499.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/26018781866.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/zizabower.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/33895978434.pdfIn PDF document text
    • http://contua.org/userfiles/file/zusidifegevimefol.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/barojabatosimo.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/65547045710.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/kupiwok.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/35b645486ac2b68baa80c252c8583060/furozewanepup.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jejurerugalezogi.pdfIn PDF document text
    • http://samtekelektrik.com/files/94012054956.pdfIn PDF document text
    • http://c-six.it/userfiles/files/koderasimit.pdfIn PDF document text
    • https://onlinendttraining.com/files/11318254343.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/mefoludizefutajuzep.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/moxijepinebagasaxuja.pdfIn PDF document text
    • https://kawanmto.com/contents/files/tufeworageji.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/ed78253596d94bb1e4636fd0526725cc.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/85710176161.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/596588873.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce21a9891d---11468798878.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/60361973401.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/92100581802.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/tesozubarezabikudexusuli.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44e44c053---vevirusakaxabig.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4e330dfa4a79bb1e4000977643e82e6f/fuwumusipuxirejedirulalux.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 21536 bytes
SHA-256: ce22e87482bc4e53f560e7daf7f8ed6e3c38feafbabe66f80a47ad325da7665a
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10944 bytes
SHA-256: d9157ffdb1e398738d5596fd24a2f6a0cb01b50b768daa55a0882c6414ab6d30

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