Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc4628bf5a59596…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 02:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 264a9f3bd3448d1d218c8090dc9318fc SHA-1: b3f6bc6f119c3a4cf1d227107a33d14847d4e1be SHA-256: 4dc4628bf5a595965f2f5297e1f4697fbc36b9e020fbe1dd0d3dafa3a3809326
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to compromised websites, many of which host PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of 'Click here to download' and similar phrases, along with the link farm structure, suggests a lure to download a second-stage payload from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://skolicka.eu/foto/images/file/4909804340.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f2ff72d55fa59bb9741db20e3eeb6406/67539984709.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9061e1fa7---41257776561.pdfIn PDF document text
    • https://basisnomor.com/contents//files/23555201617.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/fulamar.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609477d6a3795---pekezesoximuj.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/jirumo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rcb452asvb9ri1lf9vcilnhiqd/pexokefefuv.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b3e4b0c7---raxapunola.pdfIn PDF document text
    • http://ellev.fr/upload/files/togeranadikeroruvirub.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/52075652080.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/la2l7a8ctuiil3n3virfov8v81/28891734888.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/5285268913.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325939c0ba---xubosorajorulapuvuwute.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jovagezugiladapep.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/tuliperitekajabozoru.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e15a8810d---53644643393.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/donat.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/23075386777.pdfIn PDF document text
    • http://prota.ru/upload/files/roloki.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800da9177a3---keriwatebadu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57307989419.pdfIn PDF document text
    • http://www.polni.si/Images/files/29224840842.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/84081845609.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c592929efeb---lazagurefudup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=upsc+pre+exam+2019+pdfPDF 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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 17728 bytes
SHA-256: 8b8f5f4ee3633ded126c179677fee0d2007140d3a36f68523d910d04517ac869
font_01_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 10892 bytes
SHA-256: 99725d64ef25082e18aaf2202b030da28bd60c2468c9845dd2e0d1204fe661d0
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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