Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a677c26aec8a210…

MALICIOUS

PDF

82.8 KB Created: 2021-08-22 00:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ded435fa4d54276a7d53a33b102467c2 SHA-1: 97f7acc26afc1721e0cfb2a313ac1fe60435f67f SHA-256: 1a677c26aec8a210ea071c037c476dc310b6f5980b2afc70282b5eb12014a00a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/68017391826.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/xipeminunuxu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b29e00cc---31713598053.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144539eebaf---papuwelorofex.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/91484918087.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/demubamus.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/bewobigowex.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/333ff1923a2a3cd9ebb31c9b0270db8f/xizakajukogu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kunix.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b967a86654909994bb9e484241f883bd/rakelila.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/kidemoxefojigagafa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160785d8d8bdbc---peweronub.pdfIn PDF document text
    • https://italvaping.com/file/jelovelaleko.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fce1b2f6fe7c8ac89879db5ac22ff26f/41393941642.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r55tbrh23vdo0k237fo64hgasa/bitodetasafexelemig.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/88043876001.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/pimomarepewifofa.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/puxazowusubidosajidanokiz.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mebobavun.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/taronimupaluxubiropamorem.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/teluti.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1e4be234e8cf9f1fdddd9204ee3eee35/mafenojeluvisek.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/46853334111.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc95249bbbe---66872727093.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e4f67f47fcd152b0a87f70a30043fbd9/noforuzozedewanatawiraj.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160913f590117b---31972524866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+video+klip+wiz+khalifa+see+you+again+instrumentalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 17872 bytes
SHA-256: 27413add4273678c0dd3f872942f9b5bd992ff206f221259da296bbf99ff7a7b
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 2920 bytes
SHA-256: b7a8da8aa282c063e16ebd012a74b2c76bc6861c4868c9f727049cec9c14154e
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 11464 bytes
SHA-256: 31fcbaa698bdb374fa5fd366abde54538af4994ecfeaa488666241c939ecce60
font_03_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1