Malicious PDF — malware analysis report

Static analysis result for SHA-256 e184c7b65df4a1fb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbc77c736fa6ce6aa59fbcf80cbf2228 SHA-1: b73977f224a0b9f6e4425922e715b8bf4cd37f6f SHA-256: e184c7b65df4a1fbbfb54d9db86e5cb0e272e85939777b9a5d84716b1c6dfa9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kaemsp.org/upload/editor/file/53333011574.pdf In PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/70847858555.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/36332340399.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/pevajojuludomotalulilefa.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/57756354981.pdfIn PDF document text
    • https://rcot.org/userfiles/file/wejuwej.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/kosimaxupalakazixumane.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/89919275445.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/26062935736.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21365847858.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614def9d9c296---68697596697.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/vusidebezimirojudud.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/1537421113.pdfIn PDF document text
    • https://tcremich.lu/files/files/65459923470.pdfIn PDF document text
    • http://linza-market.ru/upload/files/37799079029.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jonezesulewok.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161461fb558493---68523697476.pdfIn PDF document text
    • http://anpharma.net/upload/files/masetej.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zefusugugijafito.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/75914369296.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fccbcbbe---94694374001.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/lejuperimemawudifozeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=avatar+the+last+airbender+the+rift+part+1+pdf+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_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 10920 bytes
SHA-256: 88f6a8d4bdd8d8e0d73a3c3bb5f17c733139c95ee6a1053595675d8c7889d88b
font_02_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 21360 bytes
SHA-256: 8a744afdae6fd40ebbb6b668a212e083012e74eb6aa1c6a5957375f6ac400406