Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee547f383a69598e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 06:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6264336387bfa98fb30e40a8faaca74 SHA-1: 57df5b986f243e578f38bcf782dacfa44857a9f2 SHA-256: ee547f383a69598e06a3fa391024d64c3568e663c07ed45e1175ce8569b3a07f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links, several of which point to compromised WordPress upload directories, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://peter-crooks.com/userfiles/file/92325057490.pdf In PDF document text
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/fojem.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/rasetuse.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/83487837514.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417be666d27---bafove.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b14d6661e---28576185072.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109021327166551.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/32480057584.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/60904231346.pdfIn PDF document text
    • https://primer-spb.ru/files/files/14460163419.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912180947645453.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496415991d7---kixokezukigigavumuxivigin.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/lukerumidigekaritado.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907104333.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/jifuxavivekotaxefemujepu.pdfIn PDF document text
    • http://strandedtattoo.com/file/tupewetamupumisef.pdfIn PDF document text
    • http://x-mobio.com/upload/files/8990252470.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rnm1ic0vpkn5nje3nlvoufd3bt/zolorufogixox.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bimulunovob.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/30665453002.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/30277257084.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/lezixiwadevizakepagi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/posolosofu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613124ae2d617---87214800481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=axial+overlapping+sigma+bondPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/nivuwufevuvejikesufimaz.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_off0000b3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 10928 bytes
SHA-256: ca418fd7d7b35946599792cf95441e8682dc96b7e74c49b831bef82a0ac70d71
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 16632 bytes
SHA-256: c7ea1c048eeb12de069458ac86f718cd05a3c13204658342668e14dedba9f546
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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