Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ea9ff7bddc20d0…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 16:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d835a6b1bc512b87a3e8d98042a140d SHA-1: a7d77c7af16cdccb573e00bb6d4363fee2414aa5 SHA-256: 72ea9ff7bddc20d03437780887df43886cea625ab157d42ea13023cd90840033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/32p99n3fi85qkge50lrb7jr5df/34072423328.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/wetesiwezakajoxebal.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fokutujefimanevu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a0bd1f72391c573d3f6091aa7cea9542/fulukuvaripotidigapomoba.pdfIn PDF document text
    • http://traviet36.com/upload/files/pusuzagapuw.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/pebokeguler.pdfIn PDF document text
    • http://korytnica.net/data/files/luxavamolagogaxifotaji.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/gasotabowenunobozuvizewe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0cf366961cba45a6ba8adedc2d2ac0d/sumunejusavekoxavilo.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/66246797291.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/83577659246.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/lokitut.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/21402783682.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/80131171792.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42297babd---66039962538.pdfIn PDF document text
    • https://red-adlay.com/upload/files/podis.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xuvizidozoxofex.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/62459629358.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/raposun.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0coru9aqq9ke3op6cqj2oa85q7/11317099348.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/48323357233.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/195004182.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/14550553727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+delonghi+magnifica+esam+4000PDF 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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 20684 bytes
SHA-256: 6f34b78a7d528bfb173bc306732da1e2a20902cb018fc412f0d7d8754554f143
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 11016 bytes
SHA-256: c50831d0a414d5aeeff33e89391bfd2644e268ba653596f98d57e700e114ad95

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