Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55edf0df46e9429…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 13:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 531679ffb6ba6e4ec7f078136555cdf6 SHA-1: 8abece99466a98dd199b82a1a1bfc473c50d887c SHA-256: f55edf0df46e942984fe3576496f420919dd083ac8a11c6aa5f9d45d60d270ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=email+in+my+phone PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3c2f8f8244391f2b33f544e4da2153fc/81985289052.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/wenixumi.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gizedadogotivorolamumavu.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210925015032.pdfIn PDF document text
    • http://trubaopt.ru/content/file/seliteloxeni.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/34327636711.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615380b3732ce---tewubesikamejawode.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/41675019827.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vileliwijoku.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/13204392673.pdfIn PDF document text
    • http://qwerty.pl/_data/file/2625392879.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/xanisoguwe.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/19686281048.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/jebopiwonubitefilalo.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/wibokogidanofajefeze.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910102510.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/73021985279.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kuzanumivekusinito.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/79241281427.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/nexotokufewi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158b5a0e6c---66636599391.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/wevesibegusapivu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/73eb00e38d55dd0e17861c6476a2e360/nupawizadewosul.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/dakiw.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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 10248 bytes
SHA-256: 44312e242b4eb1dd868ab25846c9d44c4952ca749014959d88c2d1486a0747ff
font_01_sfnt_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 15036 bytes
SHA-256: 8ccd67ee08ba79e739d8a2eebabd793b788a6cd25bb7f4751eb716b9a2cc1278

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