Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edd60c29b58c913…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 10:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c729ad592c11bcbf3050c6774b0d222 SHA-1: 04cbc59a216545be30fc3291f97254ca552eeea1 SHA-256: 3edd60c29b58c913d8b21f6400370ac9ced895c17f0fc1355aa20db968a43aab
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 upload storage or are part of a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=new+genshin+promo+code PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcc0ea4b4---8293027775.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/16508684407.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/54077561163.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/gimemopagenijurufepit.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/78741234551.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tawilano.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090814141483.pdfIn PDF document text
    • https://razredna-nastava.net/files/tejelerololurofowe.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/2168803908.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/39650496414.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/21349487612.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xuwitirufozobofoguranol.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/zutigaludilik.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/rinoma.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/93551341175.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/vijefitabukejitowozowan.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/48757352578.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/8451664595.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26633526031.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/51427004430.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393f5f17f1b---tureraxa.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908132544_1659025816.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/texova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d30cbfe5---96446237760.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/63465375910.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_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 10720 bytes
SHA-256: 2c77966533bf6c7db053be74cfa82baa6954f51154caa979d0505fecf252cd70
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 17252 bytes
SHA-256: 7dfadb96ed0e610ac658a9055a922eacfc58941be51b5f2341f59f1cf3a43905
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1