Malicious PDF — malware analysis report

Static analysis result for SHA-256 678f9682c2f3d8c8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96a7e682f9d90bf237877fc4ca33ff33 SHA-1: cf5388113fab12321de5b628ede375a44e6be593 SHA-256: 678f9682c2f3d8c854402281196a3fede2fb66c7f484696c4330b418418d4b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=the+best+screen+recorder+app+for+android PDF link annotation
    • http://gamjagolla.com/uploads/files/70414441049.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138674591d1d---29354277894.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16716164375.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/gejonanafulokovarin.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/nomusig.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/94689860750.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/xozodexubikunusetegufame.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/misupisuniput.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/42578404668.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/koliwudokosaxit.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/darolijifonoxubeni.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cbd597669daab2ab6b3f2c7a209f7787/40047547821.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/70799670699.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/78434771089.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/vikudepizibunakezuzadu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/60451728163.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/pumefimego.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/lupevixixelomafawagive.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/femexapotojulilubajelet.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/84425783640.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/womisip.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/sixaziketel.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/1474632530.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurefagiwu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/81502235426.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146acca4db9e---mesumagatedarumixuxuvavug.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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 17712 bytes
SHA-256: 9dd585eee09112a3a7a8a9727ec3c2b362604d1b4d0d46cb912365e169f20b28
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10772 bytes
SHA-256: da1b07e9b68afc164c9e3dcf587d0f59f634ced2b20d77e697fe1ed179060d45

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