Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46cc975351b6edf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 15:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3394e6100f075260705fa28157fc1702 SHA-1: f36dc1a116500e2e35be6c94e82c911c2a8bff64 SHA-256: a46cc975351b6edfa9c37fb55fc50fd3752a124996c681cece5d231102c88242
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with a clickable action to redirect users to external URLs. The presence of embedded JavaScript and the 'Password-protected archive handoff' heuristic suggest the document is designed to trick users into downloading and opening a password-protected malicious file, likely to bypass security controls. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, further indicate a malicious intent to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=minecraft+beta+1.16+0.59+download+pc PDF link annotation
    • https://idea-web.ro/app/webroot/files/userfiles/files/lavusetifafoperopujuludi.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/pavadizedoliw.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/84340825899.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/34167311132.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd5db44f30---8285494421.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/84263126554.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/10715259526.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lalefetinekosake.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/tidutilodozapozebemanidaj.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/6421115275.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/lipodetuvuwifaneganug.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vefodenetonowevufizuvom.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zewezebudukujo.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/45725943574.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e13b2448050aa528f9a98f8feb6f5bb0/vemomuj.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sugajavelutuve.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/sarelekofu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wewujenopuw.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/piwokikodubezu.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/94848289221.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/35473219206.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141caf1ef86c---vuvobazipozubej.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/22232946966.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/geloxivusirome.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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 13980 bytes
SHA-256: c1d8bd549f9ad6374cc2cf19b5c350178ad18fe2e4204501361ffbef75ac44d0
font_01_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 11372 bytes
SHA-256: a1328ba7c014a31fb9eda97c212faa4895bec71889e51d1c814b16be587f069e
font_02_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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