Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea58673755cbdbe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 15:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d02737581f6a14a9c27c704759c92ba0 SHA-1: 61ae03074e9784c012bc8df2a0c1072af6783598 SHA-256: eea58673755cbdbee969d10cee5e0875dfa68590073769fbf3696c7a43d7ae07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple unknown PDF files hosted on various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading a second-stage payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ermolino.mebel18.com/uploads/files/dosejukozogilufodupiviw.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/40022698262.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/87470250861.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f907933ac---setad.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/27607814417.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/31508700915.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086101227db5---mopub.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/62775241402.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nomutepobujeniminifumo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ur3js113pquv8es6aqg8k88se0/73841753256.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f60817e6d2974a3628ce18108a98d024/20353020737.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/70936024487.pdfIn PDF document text
    • http://tid.vn/upload/files/vekitazoximarowajakazu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/65610871414.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/40354492623.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f304d1f2470d1fdd6df9c50e85c74950/fovetalemut.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5117975165---merimilozajemovogeninu.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wokuxejalarolo.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/79575537760.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/815bb64ed75fa4e13ebc51c71bc16aef/15463330562.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074468fd3756---vejer.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/namisaxeli.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/83005893312.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fqkki75lcir34kik3ktphb9rbb/jovejusefomozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mpsc+syllabus+in+marathi+pdf+2017+downloadPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16992 bytes
SHA-256: b2b74cea6ba36a57467ef8f75c874182c3a336ad7362578a050a70fa387686a3
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 11528 bytes
SHA-256: b51b499219aed9f2769607b4ac2a706b35a0ee3f1696e368dd742a96dbc0a295
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1